Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ab8d8b80f5eadc…

MALICIOUS

PDF

97.2 KB Created: 2021-02-21 01:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8acf9a40ce3f0200df3abe290bbc841d SHA-1: 4b886413896890242400e91734b5fc8e154bbb92 SHA-256: 90ab8d8b80f5eadcbc4312868781110cc64b810541b99f533e4241c5ea59109c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to a book chapter, likely to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=mujeres+que+aman+demasiado+capitulo+11 PDF link annotation
    • http://wineninuxusafu.22web.org/12318187017.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/flannel_board_story_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/juduxijumijo/RAjgheT/stories_your_choices_is_matter_in_rdr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_601b0c6a5ef8f.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/imjeLjj/xepobuguzef.pdfIn PDF document text
    • http://wutigesekigaj.22web.org/bavur.pdfIn PDF document text
    • http://fewiliw.22web.org/44477862744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fff3e61d99b8.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/heggggk/sani_clean_laundromat_ada_ok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369917/normal_60034f00975fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/jegfcii/lasozujixiruvax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fde8dc617d6f.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/hijjdgi/xasoguwibidina.pdfIn PDF document text
    • http://xsafak.com/galaxy_watch_samsung_health_update_error8mhlf.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/fIbjfcP/724_area_code.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gjgfOhi/kagil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/82619901916.pdfIn PDF document text
    • http://wadedizori.epizy.com/regapevemigileda.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/que_es_psicologia_comunitaria.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/mvc_interview_questions_for_experienced_professionals.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_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 5476 bytes
SHA-256: cfdc7627589a9fb334b01a7a25503c4f239f814946d421355f5dcf765a9afcab
font_01_sfnt_off00014f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8C 12024 bytes
SHA-256: fb330b49a933851f36b0194bbbe6e46989f0a11e808cfdb0caebfd202aaa0e05

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