Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84037f6b7b7137b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 10:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5734f5cd70e36c51d91272e1735874d SHA-1: 901cfd5f18ad3e8a6947f57a882fbfade651a0a1 SHA-256: d84037f6b7b7137b3fe105b988a994bc40be2fd24d00f2919bad196cf9f18fac
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 0.9999

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://fokemale.ru/award?keyword=beginner+test+pdf PDF link annotation
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/830969.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/aGBhimM/download_wildcraft_animal_sim_online_3d_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/MMibhdi/draw_me_a_pixel_developer.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/bimim-tesujotijakok-webizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fe9418bdd8ff.pdfIn PDF document text
    • http://shopwithsale.website/94954576947gy2vr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fcedc8d32872.pdfIn PDF document text
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/1577799.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/eghFvR6/jitiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5fe05427510e8.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/boss_telugu_songs_320kbpssdbvv.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/fjjhgji/gold_bunny_bookends.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/92eb8664-564d-4835-bd87-0c76658e762b/star_fleet_technical_manual_1975.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_c1cc7627d47d42ada705dceba57d9ac8.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_ad85d774e5d8401b9a4073aa86aded4b.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_71f4053b662648d19660cb620145c45a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c889a4c7-40fa-4978-a9a2-7889ea666995/namolonetepi.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5016 bytes
SHA-256: f93d7983d4369fe7ab84d10c8a8de5b2bdac33a7a07dad02ac502a1d9135462f
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 12136 bytes
SHA-256: 601cb00d5ce703df30f7d2a739db818f7984adc347c7137c5e84b90c4fa85b93

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