Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fa758cdaae0ebb…

MALICIOUS

PDF

100.1 KB Created: 2021-02-12 21:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa5af90fd99bae2e386b6301d461e916 SHA-1: 6fd516824df773427fc4b5a722464690c46b247c SHA-256: 61fa758cdaae0ebb2348ba54253980db6a357d45d61fffa30c6665b7a9970cc1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and one of the primary URLs points to a site that appears to be part of this link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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 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://seumenha.ru/wix?keyword=flocabulary+unit+3+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff42dadb47da.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/e9ab2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366343/normal_5fcaf474e1822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5fcd88508861b.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/jhhbrku/32055731625.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/njjd2Kc/giant_food_stores._com_gcm-_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/tjegjgw/gecko_survival_simulator_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/ejf1jcO/matajedemodaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxegeza/esl_monster_body_parts_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/95972574137.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/1686757020.pdfIn PDF document text
    • http://latevafizatum.rf.gd/everybody_knows_your_name_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/plus_size_long_formal_dresses_silver.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/barista_safe_and_legal_training_costa_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/across_the_stars_cello_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tamil_astrology_software_free_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/maytag_bravos_xl_mct_dryer_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 5192 bytes
SHA-256: 9cf91336a49ebd0c6121a69e4c47fbc03f761cd13616460d95aace10d93c637f
font_01_sfnt_off00014151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 16676 bytes
SHA-256: 9f380256b4f51f301a1ff8a83e43f57a9ce5c63f8fcb78f3e2348a5e548bdc3f
font_02_sfnt_off000174cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174CF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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