Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c92e60d474ffd3…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 19:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9917a513cae4eb5c5ec9a6545ad1baef SHA-1: cffd2f8ae4bc220b544c14101a565c734777566d SHA-256: c8c92e60d474ffd3bcd46992c2ee2c0a3d1ed0d1f97a8451e359bd823a79aa60
196 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to SEO-optimized URLs and redirectors, indicating a likely attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=jimmy+albertson+mx PDF link annotation
    • https://cdn.sqhk.co/xovepejegosi/XyqheKk/oxygen_atomic_number.pdfIn PDF document text
    • http://kind-insta.site/how_to_fix_your_paper_shredder6atva.pdfIn PDF document text
    • https://rawutakoze.weebly.com/uploads/1/3/4/3/134326806/wojapajizagekejunilu.pdfIn PDF document text
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/kolupila.pdfIn PDF document text
    • http://formblckr1.xyz/nevewujidokezejafebopojaxp1sy.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/FijTKjj/84418146183.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/bC4iV6P/nibekekewimimexepuvovev.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/aZIlIib/exonerate_in_a_sentence_history.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/xuzed/lasivon.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/what_does_the_bible_say_about_facing_your_giants.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/arte_y_arquitectura_romana.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/64585013615.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/39068821169.pdfIn PDF document text
    • http://kiwitoremoropup.epizy.com/rozuxurul.pdfIn PDF document text
    • http://batefagut.epizy.com/xaxoj.pdfIn PDF document text
    • http://zuzidonul.epizy.com/vegan_cookbook_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/anger_management_for_dummies_cheat_sheet.pdfIn PDF document text
    • http://luvurabanalo.rf.gd/what_is_the_biblical_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/32902484941.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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5132 bytes
SHA-256: 44008682b4c4990329ff75531ace08bfc8cc480e18f3b9dadf4e75016d911465
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 11220 bytes
SHA-256: 864660b66dd36629088e8effff427bb65dfc5e5775df975e9a7b3a31b688b7d5

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