Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6960bc744ddb95e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 20:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 74e8029b974a6b3b2feea5a95471be5d SHA-1: a1dd87d3bdd3ee1d0fd5a0ad4f5d0f014c651ecf SHA-256: c6960bc744ddb95e0757948b22220db525bfa3a075bf1cab26f7d9a5fb3191fd
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which are part of an SEO link farm, suggesting a phishing or spamming operation. The embedded URL 'https://midufefew.ru/strik?utm_term=cuanto+es+pulgada+en+centimetros' is identified as a redirector, likely leading to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/strik?utm_term=cuanto+es+pulgada+en+centimetros PDF link annotation
    • https://cdn.sqhk.co/sisowufabo/mLhfp41/wewigadezumuderotoxito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601493a89ec29.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/gfXvuhb/afterburner_arcade_for_sale.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/los_tipos_de_funciones_del_lenguaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5feb74bc18d62.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/gdoageL/wheel_of_fortune_game_app_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/kgizOAj/t_rex_3d_printed.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/kawuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_3bd169c47ac6403d963b914fef321d50.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_a456fb2661064e298db71a6708453fd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/jobsplus_malta_cv_template.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_85a0a64ff0a045299df5015df14d9128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/munalupimovizonuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/nikeguzegizoso.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/55534369286.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_f4a5d40a2a4e4500b37203d283208c3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/murokematenesogab.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_cf1bedbc57404eb4a926c02a525889c1.pdf?index=trueIn 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 5300 bytes
SHA-256: 20968e2736b8892ac6c21da83b2dc9bee7f2913b3d289790305d73a2837271fc
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 11832 bytes
SHA-256: c6433d5012fd06a822475075efd496c892d318d3c9efd8eb3204a698175af371

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