Malicious PDF — malware analysis report

Static analysis result for SHA-256 412699feb5a136df…

MALICIOUS

PDF

74.6 KB Created: 2021-02-10 19:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5b93f4c2d94eb21ea28a89335f628e4 SHA-1: ae728bdeaf113bd288b39bfff138e339d11c6616 SHA-256: 412699feb5a136dfb517f0e61e8b563fcf323bcaa8c2e76566d7d8c5f5847136
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable domains and link farms, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=barf+si+full+video+song PDF link annotation
    • https://cdn.sqhk.co/rowalulo/ghh2pjg/nisovoviv.pdfIn PDF document text
    • http://dithetsen.xyz/planet_earth_360b1eiu.pdfIn PDF document text
    • http://aycotoro0.xyz/sentence_or_fragment_worksheet_grade_34x2tc.pdfIn PDF document text
    • http://qwert-ita.fun/atmosfearfx_creepy_clowns4edid.pdfIn PDF document text
    • http://clubstore.info/53012471093xsxm7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/KjdXehi/lovusex.pdfIn PDF document text
    • http://interbank.link/worksheetworks_diamond_math_problems_answer_keyblxj4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fcdeb1988bb1.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/sniper_gun_3d_hitman_shooter_mod_apk92nxo.pdfIn PDF document text
    • http://cmb-eco.com/best_free_facer_watch_faces_for_gear_s3rbese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_600451f4d60c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/gddigid/international_journal_of_cosmology_astronomy_and_astrophysics.pdfIn PDF document text
    • http://aov.one/ultrasound_guided_aspiration_seroma_cpt_codexwhfz.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/k9Ehghe/old_emoji_for_iphone.pdfIn PDF document text
    • http://immortal-sho.club/tiles_hop_online_poki4kqvu.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/jhR9Cjd/22544933327.pdfIn PDF document text
    • http://mon-cmbretagne.best/29278410456yoadg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd276f50db5b.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/cjbNhjE/rr_graphics_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/jwsUUxt/dovusilomapasaravidima.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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5184 bytes
SHA-256: d98778b7afd273ae033d2fb0661ed48d4af5a4ba6a204c70d5cf1753dd1a755c
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10600 bytes
SHA-256: cc12c9e91d52cb875f5513957eecb1a6c3674fdc368c0eec0a45115462a89cd8

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