Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2b2ef06eb0e5ae…

MALICIOUS

PDF

75.8 KB Created: 2021-01-11 21:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e03ff73bae4a4c8f58d19072009885d3 SHA-1: 536868eb1b42d7c3ee74f68b61d9b6b855a7c5b5 SHA-256: af2b2ef06eb0e5ae98b76add36cabba460c95bbb7f5ecf405e981df77aca4618
244 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by ML classifiers as malicious. It contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=calculate+delta+h+standard+enthalpy+formation In PDF document text
    • https://cdn.sqhk.co/letinumi/xxBIBji/5989657872.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/98ba3d1d236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f9993ae76bb3.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/7834482.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/2399604.pdfIn PDF document text
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/lemebibokid-pokuvugubug.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/nipemiri_ridisedevujaviv_tidenafosuz_febuvur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f9e0e9fd3780.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/JMa0oid/chris_young_playlist_all_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5faf96d26791f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadere/monsters_vs_aliens_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/cordoba_albeniz_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/viwivujuninuradasanupofef.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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 5404 bytes
SHA-256: 983c4fbec69cb0b84d69321dacf6570ce67bd4801a59840a98d23d9efe895b48
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 12100 bytes
SHA-256: 065dd1f16be5b20540786ffec08d348a2cd7dcd8ffbaf31b30be9278f5552855

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