Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad75c7d2b6e922a…

MALICIOUS

PDF

116.4 KB Created: 2021-05-06 22:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f3fab07a091f40769118eb660e49180d SHA-1: 53b79ffb742c002d776c4ce89e35bc55cf714075 SHA-256: 4ad75c7d2b6e922a04e037d09e684058ad9befc17edfd840ec74b1179366fa95
186 Risk Score

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 0.9997

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://druttle.ru/strik?utm_term=power+run+playbook+madden+20 PDF link annotation
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/jejafovafa-vakolurejazutip.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/1298245.pdfIn PDF document text
    • https://vaxetilunakado.weebly.com/uploads/1/3/4/0/134012354/2035c2c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/ja8EKhj/diaphragm_definition_fitness.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/nib9Zhj/merchant_bankers_legal_definition.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/4139449.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/1738795.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/hiU48VE/arkham_horror_lcg_deck_building_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/gcTUsha/gufuxusasitixajafazuzivor.pdfIn PDF document text
    • https://kaxuwuzovuve.weebly.com/uploads/1/3/4/3/134341343/nidilidewopukawutu.pdfIn PDF document text
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/sezed_towaluvemo_mebirisovo.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/wuwik_jujegadebevewon_kufele_gabowisonidideb.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/7e0245.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/03c3a362296d.pdfIn PDF document text
    • https://dirusase.weebly.com/uploads/1/3/1/0/131070798/d326ecca3c584.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/dasoxid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_165e2c458d9648dabddc10849e66c5e8.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_025e5c0c745a49fd8e64de15664a0b3a.pdf?index=trueIn 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_off00018b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8B 5600 bytes
SHA-256: a5db7c26ce5c08b995a217408b7d40400c8c87ca327c74508647270ee2845fb4
font_01_sfnt_off00019e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E96 10864 bytes
SHA-256: 1ce6c07423ab35d27c029ae83263aade0b68e9573c413176915981ec7e7e603d

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