Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9657be9bdb40d…

MALICIOUS

PDF

80.9 KB Created: 2021-05-25 12:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e720357e949a9e17618d4162d7a7053d SHA-1: 6790c9120cd37cfea7eb0d8fc684b884359c4f77 SHA-256: c8b9657be9bdb40d59957ae6c9a8264d540e5106a94076aa895fb14d52853015
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a phishing lure, specifically impersonating Netflix and directing users to credential harvesting pages via redirector URLs. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users through social engineering, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/4da1bb75f4d.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=how+to+use+samsung+remote+with+roku PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fcc7e833fbc2.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/4da1bb75f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff5d687a5cb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fcc8ed0e41ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fe5d58da412d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_604e8a3e70948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_606ba81d9f44e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6056ce3a233b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_602ace20d25ef.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/virupaviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_606e6ce94a880.pdfIn PDF document text
    • https://gitutibilaralib.weebly.com/uploads/1/3/1/3/131384503/5d3f4a3047df45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fc7f1d451196.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/5664895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_60215a432e511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_60658b1c16244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_5fce228264414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_605ca42383f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_6045e58293ad1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1468bf5-716b-49f3-a591-338d577baf60/stranger_in_a_strange_land_iron_maiden_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65743c38-c70f-41f2-921d-2971bb1b9b02/why_is_my_proform_treadmill_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2971e63e-8ee2-41fc-a292-42a7b605d7f3/world_war_z_pc_game_download_highly_compressed_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9928936f-e9ca-46a6-8ecb-f92329d0703b/ne_me_quitte_pas_lyrics_translation_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbe524d-27b8-445c-a8ee-4833f0776da9/how_to_get_rid_of_acne_scarring_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024ed398-c91d-444e-b9b5-3efa036c5ea2/40972253272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf809d8c-a614-4a72-a83d-2a8e4371183a/tekanamopula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d2d0cd-f909-43d4-8d59-e51ee30578dc/libro_de_desafios_matematicos_de_3_grado_de_primaria_contestado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae1f2be-c8a2-414c-a54c-40d2e0379fb0/what_is_the_theory_of_transformational_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec1a1ff-bd13-4ceb-98b5-f9e6f30f17a9/79918271780.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5184 bytes
SHA-256: e675423ae720a7f174b0cd1aff53c983bbd061eea2a8cc71cccbf8764ec60469
font_01_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 11040 bytes
SHA-256: f645875a0ea5f0aadc809691642201c925b1863ae50f4dcbe984cedafd2c43d7

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