Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b2b697b43c12c0…

MALICIOUS

PDF

69.3 KB Created: 2021-03-26 00:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6a85abd1b08c2ab1fe45c6e1f3d3a1f2 SHA-1: 2055426d6b5b00668757483d1bba86247f7dc9cf SHA-256: d8b2b697b43c12c0b64b059f6863f48aac30df4d7f2892c67cc30600be7bb049
124 Risk Score

Malware Insights

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

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

Heuristics 4

  • 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
  • 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/award?keyword=integral+trig+identities+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff711a7a15f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5ffc37489aff0.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/luxotazeniz.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/eic20ig/racing_experience_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/icKALCB/11668450990.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/NifThct/jet_robot_car_transformation_robot_car_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5fe17f16142f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_6034e183161fa.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/28688655733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_601cce3e7bdb9.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/457f032d-af56-4a31-820e-39ae69b7a912/92400619238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06295d3-26db-4b68-9764-07b1402b177b/valovub.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/algebra_2_equations.pdfIn PDF document text
    • http://delifas.epizy.com/virulence_factors_of_acinetobacter_baumannii.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/zefuwupedomuroninesesu.pdfIn PDF document text
    • http://zejagal.rf.gd/why_labour_pain_is_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb02cff-4dc2-414f-8e4a-b3b73ace6c00/pisoredipifi.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_1fc003464d464c948e40cd163edd0089.pdf?index=trueIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_135487eae6fa4f95b5ca03de8c6bafe7.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_ecfab87b6e0b4b2ebb3528533d6f496f.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 5148 bytes
SHA-256: ec7dc3bd7817f5211aff1498e75c2eac96775240bbe8cd6858b9863e4fe2cdd8

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