Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdf1bf764c11c21…

MALICIOUS

PDF

72.9 KB Created: 2021-02-21 12:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 750a23523cd3df45ca3df1caf85294cf SHA-1: a94040f5fad7ae1a24dc26310226f5430f81e055 SHA-256: acdf1bf764c11c2199437ec140e357b81fe202f53cadddc6e673f630dd97898c
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a high concentration on disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted domains. No scripts were extracted, but the presence of embedded URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=will+indigenous+cultures+survive PDF link annotation
    • https://cdn.sqhk.co/ragejeli/IbgcWji/rumble_on_the_river_2020_wrestling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5fff15b101bf0.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/Xhhjeza/sufelajisafawibojititun.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/fur_elise_easy_piano_sheet_music.pdfIn PDF document text
    • http://good-production9.site/where_to_take_unwanted_clothes_near_merq8o2.pdfIn PDF document text
    • http://yewes.space/246439901910mg3w.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/dJ5hgpk/massive_meteor_strike_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5fe470f8d1a48.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/U6Iibjg/police_car_simulator_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5fd85e76affd1.pdfIn PDF document text
    • http://pomevufe.22web.org/42655342038.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/ha2hf55/ladiwesimupugetat.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/70879664385ip46u.pdfIn PDF document text
    • http://sait-ok.ru/adblock_free_windows_10_firefoxjvtf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/evesham_nj_police_reports.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/nelagifoduxewilirelup.pdfIn PDF document text
    • http://rojegasofibi.epizy.com/shadowverse_forestcraft_deck_guide.pdfIn PDF document text
    • http://nanesipub.rf.gd/rinidex.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/classic_wow_protection_warrior_leveling_guide.pdfIn PDF document text
    • http://wogafut.rf.gd/kufevupum.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/raf_air_cadets_uniform_regulations.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 4968 bytes
SHA-256: 5fa17d2cbd564ea6a89b5c1b0fcdf70843db2de7d968b9be14c66641e937e0f1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 10984 bytes
SHA-256: f03d59c95008123c3454f1b56687b6fd786afc1275dc1d06ede3cb90efe7cb63

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