Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c61e3adf46feb…

MALICIOUS

PDF

90.0 KB Created: 2021-04-28 04:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff969ede031eabde589c643685810d35 SHA-1: f15364ae91b322514e9c60a65a5685473b8a8e8f SHA-256: 658c61e3adf46feb0d7288c0223d4f7e0c9b518ec0d733f36d24fc4de2ebca80
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host many links on potentially untrustworthy domains, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=newspaper+layout+design+ppt PDF link annotation
    • https://cdn.sqhk.co/tirinakiweda/hchezhb/disaster_recovery_plan_template_azure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6052b95dc1c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5ff1d72763b0e.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/36132706819.pdfIn PDF document text
    • http://keksik24.ru/how_to_get_your_motorcycle_permit_in_maine2brs7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fed8f71ce467.pdfIn PDF document text
    • http://libertinemodels.com/26367799296cyx28.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/honda_mower_hrr2168vka_parts.pdfIn PDF document text
    • http://kushtanash.ru/excel_vba_array_length_functionde231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6012daa525d83.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/922712983.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/ijhdjhr/stickman_legends_shadow_wars_mod_unlimited_money.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/zuwijarpi2hw.pdfIn PDF document text
    • http://itclick.pro/22282641930bf4sa.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/yAZhicS/meravajabazadorunikep.pdfIn PDF document text
    • http://springtea.space/zutubeduxapo6ljkf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0ce81a-8ca0-4610-a0ad-ca25e1797068/30639837633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f4a551-d0bb-4fb2-a4f3-32dd22ef1429/is_there_a_free_sketchup.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_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 5288 bytes
SHA-256: af19eae76d0630e6c0365d529e4aa22b4ddf6f9a3da16792551a8b0c0b90fe19
font_01_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 11428 bytes
SHA-256: 8d3e6701e928399c615000088ae37fe75afc0a2139f7e9edbb31c8abb02306a4

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