Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cab770977c2cc8d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-26 10:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7f33f6541c314016a7859867b0b471da SHA-1: 2aa902943de5ed6475ed7a46ac09c7315e99df6d SHA-256: 8cab770977c2cc8d8d58765c51bf9561449661d6e3f26bc4aa09735bd9c7ce67
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, indicates it is presented as a book summary, a common lure for phishing attacks.

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://golowaki.ru/strik?utm_term=resumen+del+libro+el+profeta+de+khalil+gibran PDF link annotation
    • https://cdn.sqhk.co/molofagaji/jfMdge9/zupasosojefifexewake.pdfIn PDF document text
    • http://health-top.ru/10293532063ypwzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_604c9fad3de16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_605654b0e263f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6028b7d26cd73.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/e0oBiaw/famous_blues_musicians_2020.pdfIn PDF document text
    • http://topfrag.rip/sosokofadau3baw.pdfIn PDF document text
    • http://bovotuguf.iblogger.org/brother_hl_2170w_drivers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fec04a209c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_603663b585dc0.pdfIn PDF document text
    • http://luchdobro.site/58048733840dh67s.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://floradoma.net/26236146448mrcse.pdfIn PDF document text
    • http://gabigad.22web.org/38364206707.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/wujodibu/11112905753.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/home_delivery_meals.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/wesapevubonuwepolimelo.pdfIn PDF document text
    • http://nafakosoleg.epizy.com/bivutovekuwerovetodox.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/mobefupifituxivu.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/morningstar_direct_instructions.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 5668 bytes
SHA-256: 6c85fabacc75c72df6b2af218212b9ef03e39c723698a5364823860845959902
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 11560 bytes
SHA-256: 13da06be37fd468888589d9546bbeedc2a54b810ff1c7796144a9f8e73729d09

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