Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1899caf3ae31d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-12 00:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 94e56fb434708777a816b9d822f7c0a1 SHA-1: dc10cba4df822c8909c00c3e8375dcdfe7bbeaf7 SHA-256: bca1899caf3ae31d587d341dee51a82872100129ff01e11c0584bc20aad94b06
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely exploiting the user's trust in document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=introduction+of+biochemical+test+pdf PDF link annotation
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/bbe64734842.pdfIn PDF document text
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/4077830.pdfIn PDF document text
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/8880f65fa9029e2.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/tovonerefetoge.pdfIn PDF document text
    • http://1pokypki.website/xfinity_remote_code_for_rca_roku_tvo0t0i.pdfIn PDF document text
    • http://bluebadgeapproval.com/sudezolakuwovugmrl51.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/important_physics_constants.pdfIn PDF document text
    • http://allostar.buzz/krueger_sheet_metal_wau69wt.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/fewuduwos.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/nusofamekumirufup.pdfIn PDF document text
    • https://cdn.sqhk.co/gasowifozil/Eqiecqc/fruit_cutter_set.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ijhchdT/nizizijevam.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jjdieLG/cruise_outlet_glasgow_fort_phone_number.pdfIn PDF document text
    • http://cadenalia.com/statistical_mechanics_book_redditvfu9q.pdfIn PDF document text
    • http://fortuneo-enligne.com/bail_application_format_in_gujaratic6dku.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/gfMhchh/xumuvatomido.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/xamebepax_wazuxubav_vizoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zelusovudexa.rf.gd/kirotukise.pdfIn PDF document text
    • http://dofagubixipo.rf.gd/baby_rudin_reddit.pdfIn PDF document text
    • http://mojozore.myartsonline.com/49817963913.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/32945242070.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_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 5472 bytes
SHA-256: 3c37f7be1151a8f4ea368cb9e646e65f4a6f2e40b2237cf218c278428e7b9f03
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 10460 bytes
SHA-256: c6290d3a2f8820027eb050eae683d0058b934b5d7682c0bf43b28a8197ad5d81

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