Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9170a760820f32…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 16:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d813fb1f6714535908cae079478323a7 SHA-1: 95e3e74382aaef38dd0142af05bed54b2235ff22 SHA-256: 4c9170a760820f32092f9ce406f98e5a5fc04b6ed1df5c52c916573aab0edeec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=navy+start+guide PDF link annotation
    • https://cdn.sqhk.co/guvawatuzax/fSOjbGZ/arjun_reddy_movie_video_songs_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/dUjjiUs/2pac_california_love_mad_max.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/22419623554.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/anthropometry_for_interior_design.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/Ophf1hc/dual_monitor_desktop_computer_best_buy.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/1bdcc7bf-dd6c-48ad-82d6-22b948365da5/6957605939.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_791f7e0436f44fc7b28a76319d6968ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dc9567-ace8-44c4-8f5f-d37ea8f79734/how_to_replace_furnace_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645a6c8c-5284-4d8b-8732-81efb3166444/digisamijuweg.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/what_type_of_volcano_is_a_caldera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4743b93-aeab-4f26-9514-30129967aa48/42616370183.pdfIn PDF document text
    • http://gozudil.onlinewebshop.net/vugapo.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_61d6815c6ad84913ae8e475adb8017ab.pdf?index=trueIn PDF document text
    • http://fajazimigig.atwebpages.com/pride_and_prejudice_by_jane_austen_novel.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_0db2714393c5416aa05a27ed9be5bdd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc18260-cc7f-47d3-8111-a92130e5a678/83369037711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d871cd85-925b-4e50-b728-20639c507c01/31067892679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab0e751-ee11-4c2f-99e1-80ac886af977/5641542135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ecce1f-7809-48e2-9fdb-fb4791d1ee71/group_threat_theory_sociology.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_b4b25875e68b451f9ce0dd93c826bb32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a8462d-9a80-4af6-9254-ea68ceb42321/dizewojakamipenepu.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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 5092 bytes
SHA-256: 34f883d0a378a219c4ff3c70bdff2695986622b255e4540e5a2cf93f10aebf0b
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 11168 bytes
SHA-256: 1d7f96100bc5172758829a300a9ae7234926e2c8ea124600e60807d9f275d8a4