Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24a901aeff4ab83…

MALICIOUS

PDF

73.5 KB Created: 2020-11-30 14:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ddc7fd0dda58e94535b5a4c3b409e814 SHA-1: 1ed5e1cd30a57b4d0761d1834a4e4de06a7bf85e SHA-256: a24a901aeff4ab834d8935c519a2f23ecf0b67ff37e0ad8c1cb549d519ea7832
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO abuse tactic. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://trafffi.ru/strik?utm_term=kitchen+table+wisdom+quotes PDF link annotation
    • https://zumegarilafexiz.weebly.com/uploads/1/3/4/0/134096691/guguvunojigupas_vexiwani_davuwupuro.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/jibebepuxapupumus.pdfIn PDF document text
    • https://patekakedosejot.weebly.com/uploads/1/3/4/4/134479085/nozumejo-vipidukuji-jikivunewozuki-zapoko.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/salagarifug.pdfIn PDF document text
    • https://fegunase.weebly.com/uploads/1/3/4/6/134603704/e611b.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/mogoxo_vekob_zoxowutaf_gonuw.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/virariwomazaturipara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd26e6fbb67f096305560a/1606231785313/worksheet_5-59_genetics_matching_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe000161e25426e1ff4c2e/1606287362382/xakirifawijonez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c01372-d057-4643-a403-07b7640940df/tisenejizuwig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1217a0-c3b5-4761-a0dc-9258257b4486/juruda.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/running_with_scissors_augusten_burroughs.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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 5412 bytes
SHA-256: 173a2c164f322ff32e2b36bde7a55c6efc745b9bc432a242b45f9272fc504eb4
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 9976 bytes
SHA-256: eab467cfe62b385e7ecc976fcf7274859b6605310f158bc5130a1f12df505061

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