Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdce62561806f25…

MALICIOUS

PDF

85.2 KB Created: 2021-03-29 23:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f5e5e9c3bbc6c9680963a9b40702e0f5 SHA-1: bd57e13df5a7ace406bc09ccc2a0bf1a42e0070f SHA-256: ccdce62561806f258afecbba1dac66836ccf670be1a8b033d2b460591f38bc09
126 Risk Score

Malware Insights

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

The PDF contains numerous links disguised as driver downloads, pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or exploit. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=dell+poweredge+r510+drivers PDF link annotation
    • https://cdn.sqhk.co/pemiduwegam/ijbSjiH/58543473954.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/1928295.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/sogasijovixasopetugadox.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/O25Uieg/pexiriropulesupap.pdfIn PDF document text
    • http://weroserigo.22web.org/epa_combustible_waste_guidelines.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/tinker_tailor_soldier_spy_ebook.pdfIn PDF document text
    • http://nuwevabufa.mypressonline.com/amazon_web_services_for_iot.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/5geFohg/stamped_cross_stitch_kits_amazon.pdfIn PDF document text
    • https://sokamokijajupi.weebly.com/uploads/1/3/5/3/135348419/jesakibupuborow.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/81347645014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_60446e38cd7d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5fddda01bd86d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujabezemaluwe.rf.gd/84555002501.pdfIn PDF document text
    • http://jokilezitewoj.epizy.com/kaufland_gazetka_wybr_formatu.pdfIn PDF document text
    • http://wavedada.epizy.com/70820462239.pdfIn PDF document text
    • http://fosixokosed.rf.gd/air_pollution_information_in_marathi_language.pdfIn PDF document text
    • http://fijedenojex.rf.gd/gugimatumivafojokagifivo.pdfIn PDF document text
    • http://nuwojore.epizy.com/11463440483.pdfIn PDF document text
    • http://vubalek.epizy.com/medical_fax_cover_sheet_samples.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_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 5384 bytes
SHA-256: 8d69bd9733a0871ce6d4efe0dc8d9261ae14bf33b6da3e1d6341927bfae165ec
font_01_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10424 bytes
SHA-256: 8551020c072191145c6814bc7bd8f6bb2f37e7a83d1d8a28fd6d61f0f259f583

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