Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf0852e9604a085…

MALICIOUS

PDF

78.7 KB Created: 2021-02-24 03:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 969a15d7c407fb873da00a5e634d284a SHA-1: 030756ddb2bca315158668b3f53d6e788d90fc9f SHA-256: 7cf0852e9604a08501cc9a667dd53519f768c0bf524a733e5928b7fb8e5586f5
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one specifically designed to mimic a search result for a technical topic, likely to trick users into clicking. The PDF also leverages disposable hosting domains for some of its links, a common tactic for malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wb?keyword=machine%20learning%20algorithms%20from%20scratch%20with%20python%20jason%20brownlee PDF link annotation
    • http://souve.me/69963084319ijfh.pdfIn PDF document text
    • http://instasurprise.online/raypak_rp2100_parts_diagramh8von.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_600f0ad218845.pdfIn PDF document text
    • http://mebel-albero.ru/rutatibusardq5bl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff6c11f96bfd.pdfIn PDF document text
    • http://nesobaka3.xyz/the_collector_book_scholasticyj9jq.pdfIn PDF document text
    • http://golden-charm.ru/40178269419zlgkc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budokukikaririd.rf.gd/bahubali_2_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/dinosaur_king_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/who_were_the_four_rightly_guided_caliphs.pdfIn PDF document text
    • http://fegidil.rf.gd/xukewovivotavimeta.pdfIn PDF document text
    • http://xevesekelegi.epizy.com/fiwosesot.pdfIn PDF document text
    • http://filanovedo.rf.gd/99063859008.pdfIn PDF document text
    • http://xawoforusur.epizy.com/57212726872.pdfIn PDF document text
    • http://suferipuwa.epizy.com/74256677603.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/rubirewoluxosivilamexun.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 5844 bytes
SHA-256: ecb8b8e79fbead95b31da61187adf38e25ea9bc0b50dc039af845ad3da946fac
font_01_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 11008 bytes
SHA-256: ab10cfab59fcd758be860d5355e2e1c7c45d000627e234275dcbee27862278bd

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