Malicious PDF — malware analysis report

Static analysis result for SHA-256 acedf4627ce832d9…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 18:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ecb390c826e4fda1d6ca169d10e9a03 SHA-1: 50c985b9fb9298bd46b40c91623070eb86c6f5d6 SHA-256: acedf4627ce832d971acf1147b40334649a465d2d75e53978a9de5b8b6c34c94
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=rpg+manual+as400 PDF link annotation
    • https://cdn.sqhk.co/dukoredod/ijGjegg/63692747935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60263b2ba7ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_6007ab74bee7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_602088e300256.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hhP3ieo/pirate_battleship_game_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jd0Yihf/88743438400.pdfIn PDF document text
    • http://cheatyou.site/taurus_g2c_vs_g3c_differencesah3eh.pdfIn PDF document text
    • http://dkmz2.club/38887153723qhduw.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/ajguf1D/at_t_personal_cloud_cancel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fe25301be5d1.pdfIn PDF document text
    • https://cdn.sqhk.co/lasotepana/yChhhic/soxajezenowenupozuvepuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fce8517a5ed4.pdfIn PDF document text
    • http://lngcliente.com/zenikepelizatowifakeson7064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_60010342a1815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefigubisi.epizy.com/93772748396.pdfIn PDF document text
    • http://teworubinogo.epizy.com/stock_market_open_on_mlk_day.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/geometry_textbook_answers_chapter_12.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_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 5280 bytes
SHA-256: ca69477eea7571dce946b06aa82590a21e578cd6e9fe6bcd6bc0523aecd4d9d4
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 14824 bytes
SHA-256: 67ebd317e98768f6f00c25e3ec6f5846906047495c67afa8c0be97f9199fa1f6