Malicious PDF — malware analysis report

Static analysis result for SHA-256 660a2c01fe417be2…

MALICIOUS

PDF

86.6 KB Created: 2021-02-17 03:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cbc6e633ad0f8e55e00523bb0377b20e SHA-1: 5281117ad588382e7454d87c7fcd9f365a2fe93f SHA-256: 660a2c01fe417be24db613814d3d101aae2e8e12485b37c6c0defdeb5825d67d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for malicious purposes such as phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to external content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/aws?utm_term=how+many+calories+does+a+small+wendy%2527s+frosty+have PDF link annotation
    • http://fragcups.com/tafelukukutew9rgqf.pdfIn PDF document text
    • http://1s.london/invasion_of_grenada_1983_apushrp0g5.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/83509120102wwcy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_6012fdfee250a.pdfIn PDF document text
    • http://vsspb.ru/9726372385854cg3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_60072041e1d5f.pdfIn PDF document text
    • http://gifipagi.22web.org/98612885587.pdfIn PDF document text
    • http://cabinetsly.xyz/anime_slayer_app_freen4qd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fe532f549c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fe87f5ad626a.pdfIn PDF document text
    • http://hookup157.online/behaviorism_and_social_learning_theory_views_development_asxkrsl.pdfIn PDF document text
    • http://sreda.city/workaway_international_cv_formatv0k9t.pdfIn PDF document text
    • http://boxberry-24.cc/rosoxafipiv0bc62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawozenagi.epizy.com/texomamijosilazex.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/ga_guidestones_commandments.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/flat_stanley_letter_writing_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/maplestory_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/driver_kodak_alaris_s2070.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/23650704846.pdfIn PDF document text
    • http://jonebitomire.rf.gd/92124974490.pdfIn 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_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 5508 bytes
SHA-256: 5f3cfc83537052b778625a6ff17fbecd23d4c088fe98099a23c868806ba60bb2
font_01_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 12008 bytes
SHA-256: 330fb53bf3f03ac2fb308c85002e718372b3b130a799d76d27a1e01e0530b30e

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