Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83505ae6e04c3e6…

MALICIOUS

PDF

71.5 KB Created: 2021-06-02 15:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5615c0664b1ea77e575f44292c7ae948 SHA-1: f4ed85e9654abd6facfb97507452d155e3589260 SHA-256: d83505ae6e04c3e62ee5e5f2005498b2d5438c5a344f195522e455b6934b8248
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure for a book download, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/pbw?utm_term=libro+como+ser+un+macho+alfa+pdf PDF link annotation
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/3959007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_602626037dfb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_60566f973747a.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/9107068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6062f26096913.pdfIn PDF document text
    • https://zopivorideruv.weebly.com/uploads/1/3/3/9/133997575/9ea0f883d832f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389376/normal_60b0a92e3d83b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_605687d43cf5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5ff21f850d7bc.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/a4c08b.pdfIn PDF document text
    • https://dazujaxika.weebly.com/uploads/1/3/1/4/131437396/jidaxepivunaga_sazegojavul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd241e292635.pdfIn PDF document text
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/raxekugiti_joragesulu_nusinewaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_6049494f14488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_605d86619cf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60208dec7492e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_6039b8006aafc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144444693/why_wont_my_mower_deck_engage.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144424143/canto_para_acostar_al_nino_dios.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5476 bytes
SHA-256: 4cd7604df80c492043c3919523f79933445bc899c76c9d6f5ceaede7a476a58b
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 11452 bytes
SHA-256: cd763156b023298e7d6cb6547b8abbe20a86f38175276b1a058f8b820b54429b

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