Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fa7b6bbbae2357…

MALICIOUS

PDF

95.5 KB Created: 2021-05-08 17:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f615af289e581dc6c0a04b4d741b89f0 SHA-1: 7f6856548734f0c7077c698788239872cf047018 SHA-256: 84fa7b6bbbae23579ce1662c89151b513b721555b4bdbaefc911cd1d1252f8ec
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=maytag+bravos+washer+not+spinning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fcce932c8de8.pdfIn PDF document text
    • http://shtampshop.ru/gobituwaguzarefijigefowalpdwi.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/frOiagd/xipimuminolekozajomewuson.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/gjQjifu/tube_video_downloader_apk_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_6069955f73018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_600bb0fb9d38a.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/1iexjef/big_blue_marble_tv_show.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/qih3bjb/28467088749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_604fa70a1ff1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603101ef12bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6057c5baa39f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6027c1f2ad060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_605a090e88e78.pdfIn PDF document text
    • http://miiliioner.xyz/voice_recorder_appud50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_6043f78b11e8c.pdfIn PDF document text
    • http://topsol.xyz/the_linux_programming_interface0ppgw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_6033626640ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5fd814ce7ccc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisawujeza.rf.gd/11721152615.pdfIn PDF document text
    • http://wusanobe.rf.gd/90752818809.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 3304 bytes
SHA-256: d7d013408685d1bf1dc1dee1d90893ea0daaa0e4e5db9584292ef4d00e01cff0
font_01_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 5448 bytes
SHA-256: ab9efcfd902ce246e56cc0df2597d2ecca0c62a82f178d1cbb2b4d7dd8615dc8
font_02_sfnt_off000144fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 12268 bytes
SHA-256: 928923f117bcde39fe4aa076be2d8a1de968e733736c2a5f2d3bceda00ed7ed8

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