Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d9b3367cd9ea2d…

MALICIOUS

PDF

65.6 KB Created: 2021-03-14 12:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 91f911f3deaa06fa314d6f9dec27c101 SHA-1: 1c20d31901c7e57430b7e75e126a3a337281d276 SHA-256: 09d9b3367cd9ea2d3df89166191b15dd3c59ba3227fa7eef3c381f082957f9d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/123?utm_term=ben+ten+omniverse+2+apk PDF link annotation
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/bopupir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fcfaf30555ff.pdfIn PDF document text
    • https://ninuwekij.weebly.com/uploads/1/3/4/6/134625354/4273295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcc99fb4e3bc.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/rigemofaw-kojetabumaxaxu-sirat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_60493f67992e9.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/32206e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_603a41ee6015e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5fda0f831e9ac.pdfIn PDF document text
    • https://xawewidijaxiju.weebly.com/uploads/1/3/4/2/134266046/14db54a.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/238328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujunuge.rf.gd/csir_net_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/crystal_report_for_visual_studio_2015_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7624a69-f3e6-45b8-9110-6f01ecc8123e/57792378882.pdfIn PDF document text
    • http://roluvad.epizy.com/76266733330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18486d54-a73a-4d62-a1a0-9b89be7eb32b/96598981267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52126c77-49f4-470b-9eb3-368fbac74970/what_is_alkaline_diet_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/square_root_of_250_in_radical_form.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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 5240 bytes
SHA-256: b6b06532fea7f811966264d7850f16aa05a66d2a334404d89bfcdeaaafe7db88
font_01_sfnt_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 12828 bytes
SHA-256: 0832aa71d9949aeacde5c79eba35d80016063fc01a09097eefc3ea6b2b114ae1

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