Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7e06fcbcc29d96…

MALICIOUS

PDF

75.4 KB Created: 2021-01-16 23:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e0591cb88ef534ef20adba201e926f6d SHA-1: ed58a7e5bd891b5776c16faa3062d027e5328e8e SHA-256: 6c7e06fcbcc29d96834fc103d338ac8d1a9b9a4adf2d66dafbba5eefaf58c337
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or distribution network. The primary URL, 'https://traffset.ru/123?utm_term=2012+6.7+cummins+dpf+delete+instructions', is presented as instructions but likely serves as a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffset.ru/123?utm_term=2012+6.7+cummins+dpf+delete+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fa4520fcc345.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/e0gepje/mountain_climb_4x4_game_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/uhb2if8/63162966599.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/hLChbk7/i_miss_you_touching_me_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/ggeKgh3/34756248445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5ffd09d40f141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_5fc117e79bb6f.pdfIn PDF document text
    • https://site-1249629.mozfiles.com/files/1249629/different_types_of_pneumatic_valves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd30d728a401.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/WQtheqh/forest_river_arctic_wolf_321bh_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/9ibGigt/911_emergency_hq_city_rescue_mission_jacksonville_fl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_600327aa16e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fc2811a375fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_5faa3280cadaf.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/vomewutivur.pdfIn PDF document text
    • https://cdn.sqhk.co/rixazezozo/a6hhehj/history._com_medieval_times.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 5588 bytes
SHA-256: 670919af2e3f5c7809decd43c040a19e11c1d0cf372beaa623dfa144422d295b
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 11136 bytes
SHA-256: 0678f3bf961ed9384b289e73bdd936423bfde744c06e8c3f4216a58008aaf66c

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