Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6292c5f1729882…

MALICIOUS

PDF

71.6 KB Created: 2021-02-17 17:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3cda942728eb5bcd60d5150959ba22c6 SHA-1: a1ad0249160177759aeaa4f9be86ce8f8fdfd107 SHA-256: 9f6292c5f17298829515f4a98abaa1cf8cb86032a9bc67addad94bc9bf42abfa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a link farm, with multiple URLs pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The primary purpose appears to be directing users to a network of potentially malicious or deceptive websites.

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://maypoin.ru/wix?keyword=axe+throwing+seattle+bar PDF link annotation
    • https://cdn.sqhk.co/vuwipabobatu/cWitght/fetax.pdfIn PDF document text
    • http://it50off.pro/reiki_master_course_onlinen6y30.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WKrO9YQ/word_pets_free_word_games_answers.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/1926884.pdfIn PDF document text
    • https://mavosawiki.weebly.com/uploads/1/3/1/1/131163846/fadexo.pdfIn PDF document text
    • https://vamotavobepud.weebly.com/uploads/1/3/1/4/131438348/3fa52b609.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/jajezugemijada.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/d7bf390213aa4.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/Nnz8ie5/nuke_minigun_fallout_4_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/nakolore/ihhhyih/idle_racing_tycoon_car_games_apk.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/6277659.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/gQgdAgf/spell_defense_epic_bricks_breakers.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwogoxozoxi/jhiBEhe/lucky_party_scratch_to_win_legit.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/jurenina_bupazoxaputakaj_gedazaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/cgcbhb8/tech_news_top_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 5236 bytes
SHA-256: 999f8f0b42c84e58b708e19432aa60302a82bbc1f09a2b2c0a251c0829539a1b
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10528 bytes
SHA-256: ca3e4143bba1f276e039536a07f9706e3f0075b08b38a7f1e6bc87cf7ebfd337

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