Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d6862b07a10107…

MALICIOUS

PDF

103.1 KB Created: 2021-02-19 22:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c15aaaa53082f66173446c457244f0d SHA-1: 844db351348749930741bb6f1e62b4f5c5e5dda9 SHA-256: c7d6862b07a1010778b6d059d7282ec644192a5938847443f5a9a67c48ec82c3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'call to action' and is generated by wkhtmltopdf, a tool often abused for creating malicious PDFs. No scripts were extracted, but the presence of external links and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

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://baarspo.ru/123?utm_term=what+is+meant+by+call+to+action PDF link annotation
    • http://powerhdniy.space/queda_livre_fisica_exercicios1dnbr.pdfIn PDF document text
    • http://autoport76.online/lamuvasufudab5m5l.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/53606cc.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/rujazo-nusutexixodagox-fosejuju-feturofiwi.pdfIn PDF document text
    • http://sobakin.space/driver_certificado_digital_serasa_experiannhdob.pdfIn PDF document text
    • http://look-hotel.com/ironing_sheets_quicklyki023.pdfIn PDF document text
    • https://defilapaxupote.weebly.com/uploads/1/3/5/3/135335242/9211028.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/njbCjdr/69452235795.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/dhbVVGf/classic_chess_set_designs.pdfIn PDF document text
    • http://siteznakomstv69.space/mad_dex_for_pct8t3j.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/biiztgg/70784231890.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/4948037.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/riwiwunagitobonaxed5pb.pdfIn PDF document text
    • http://reawolt.online/2026496389251s0c.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/1295c71c78.pdfIn PDF document text
    • http://uplrezina.site/akbingo_episode_290_eng_subbts5k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimaninerif.rf.gd/free_russian_keyboard_for_android.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15771 5200 bytes
SHA-256: eef2187962881fdc3f6257e0a544d6b3fa1a08b86c980a252137b02986f571cb
font_01_sfnt_off00016910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16910 11196 bytes
SHA-256: 1e427932c3028b057280051bbef15b1a699ee050ef4c42de0e5c2370bdb30333

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