Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c760f8d269f91ed…

MALICIOUS

PDF

85.6 KB Created: 2020-12-04 04:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 948db92244f31bbf137540db26475521 SHA-1: 7581aee30bd88221d8ff51d5401b3e5c4205607b SHA-256: 8c760f8d269f91edefe4d8b93947e3e80d3e343a4998a0f3c75ce312505b01b6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it contains external URIs and a callback phishing lure, suggesting it aims to trick users into contacting a fraudulent support line. While no scripts were extracted, the presence of embedded URLs and the phishing lure strongly suggest a malicious intent to deceive the user.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/strik?utm_term=viper+5701+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8cfd7146756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0879da3bf4b14aba759f2/t/5fc0ffb13570fb44d126bcc5/1606483890229/woloxutosoju.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfba779c08c7f2b9edc67/1606220712832/whirlpool_wdf540padm_dishwasher_not_draining.pdf
    • https://s3.amazonaws.com/fusidejebi/who_is_mark_harmon_married_to_today.pdf
    • https://uploads.strikinglycdn.com/files/ed76ea37-3b87-47cf-b685-2f2f15251802/tri_med_transportation_kent.pdf
    • https://s3.amazonaws.com/kujesulad/porsche_996_carrera_performance_parts.pdf
    • https://s3.amazonaws.com/fejififimaketo/larus.pdf
    • https://s3.amazonaws.com/vuxalirudidel/little_people_zoo_animals.pdf
    • https://s3.amazonaws.com/julaxel/digestive_system_histology.pdf
    • https://s3.amazonaws.com/jemazejodep/xovasuwaregapuzow.pdf
    • https://uploads.strikinglycdn.com/files/46709df1-a285-459c-8145-330553a2ef99/mega_peliculas_1k.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001102d.bin
474977f893cbfb3f32071cb57f42c6cd25ead451410c9b2b9828f4ee9e79d635
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 5372 bytes
font_01_sfnt_off00012279.bin
9837c75fc488a2285ab67b70cb47a3d1c04a77a05bfeba2d614df6bb97ad31a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 11924 bytes