Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb32750634586d53…

MALICIOUS

PDF

87.3 KB Created: 2021-04-14 21:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38fd4b2390649604eb70b5ce67b0c46d SHA-1: 21f02a55aec836f350523307e5f25e95723f30a6 SHA-256: cb32750634586d537dad2751ee50a707769d4295756bb24dbbff9f5c9afca0fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=best+ballads+of+2010
    • https://cdn.sqhk.co/jogujufuza/ibhcigZ/37342375824.pdf
    • https://newowuwaw.weebly.com/uploads/1/3/4/6/134634034/lawodotudesibo-desununiveb-fezejet.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_600cff4b0f639.pdf
    • https://cdn-cms.f-static.net/uploads/4496586/normal_6059f2a67213a.pdf
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/jekeberuzufofinijiru.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd1f4d3ec14c.pdf
    • http://xazezojalaz.22web.org/zirurixuvijerus.pdf
    • https://cdn.sqhk.co/bikegola/ajgxE1y/libusotarawijesul.pdf
    • https://fomutifimo.weebly.com/uploads/1/3/4/5/134594787/9328237.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5fd0ac123bf5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mupukesunobaga/pafonidazajuxebadabiwo.pdf
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_f88d6d9ac3c94b9c9d2b04b13ec132c7.pdf?index=true
    • http://dedamedasobime.epizy.com/dijaxikofagizojipigi.pdf
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_b0613ddf7e3f415c831024e3d66446dc.pdf?index=true
    • http://lapumugafo.rf.gd/lista_giocatori_fantacalcio_gazzetta.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6d40432fc78c4e2ea737cecb6276e09b.pdf?index=true
    • http://mutaloliz.epizy.com/78710894692.pdf
    • https://s3.amazonaws.com/lopeteb/90741271752.pdf
    • https://s3.amazonaws.com/luramamelolem/ahsoka_tano_book.pdf
    • https://s3.amazonaws.com/wixatax/us_army_unit_flags_for_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118e1.bin
854047c121719b77ea8b56ac7308d45c5b66bacf0101dbf2eae6c2d462fb6d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 5320 bytes
font_01_sfnt_off00012b10.bin
1bf81c5527ef4336495bd276f174c52d3d7daa6ffe7a8e8150528f6b8ca2d9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 11032 bytes

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