Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e9508c49e9ca56…

MALICIOUS

PDF

90.8 KB Created: 2021-05-23 07:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17db342f05d92ae1bcb6ebbf3edca05 SHA-1: c2870431cd07b0157b41b0f9545eb9ba78fa2187 SHA-256: 91e9508c49e9ca5632f26395214925673acdb8f7ce71744d473292432308d79b
96 Risk Score

Malware Insights

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

The PDF file contains obfuscated text and a heuristic firing for an external URI pointing to 'seumenha.ru'. This URL is likely used to host a malicious payload or redirect users to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=clash+of+clans+base+design+th10
    • https://cdn-cms.f-static.net/uploads/4413231/normal_605893c0813cf.pdf
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd7cfa21fef7.pdf
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6023718f913a0.pdf
    • https://static.s123-cdn-static.com/uploads/4454825/normal_5fc94cf57ebea.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_605aa1d4c0520.pdf
    • https://cdn-cms.f-static.net/uploads/4444874/normal_60293227655bb.pdf
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6034ebe41360d.pdf
    • https://cdn-cms.f-static.net/uploads/4451752/normal_60639216aea88.pdf
    • https://static.s123-cdn-static.com/uploads/4412583/normal_5fde39dea5502.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_603b06872c673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/241dbaaf-9ccd-4975-9587-1c82a4ebec8b/56538957949.pdf
    • https://uploads.strikinglycdn.com/files/a04d6b99-6546-439a-8ab8-4a266bd44e24/14784628018.pdf
    • https://uploads.strikinglycdn.com/files/a55d80cc-c519-414d-b532-f15ee2c38e6c/6128864253.pdf
    • https://s3.amazonaws.com/nodetuxapabara/essential_toefl_vocabulary_2nd_edition_flashcards.pdf
    • https://s3.amazonaws.com/legenapi/how_to_install_vivint_element_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/8d6b0428-224a-4be5-8f85-90c04693ff57/how_to_install_vinyl_car_stripes.pdf
    • https://uploads.strikinglycdn.com/files/e4d0f785-c5b8-4fd5-a6f8-8e28e80649b4/nepetiloboxejojunipid.pdf
    • https://uploads.strikinglycdn.com/files/24104c7c-b832-4b20-9503-49fe55aaca6a/78029268284.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_off000124f8.bin
3ba74775ca564afdaac1daccb9e4afb1f1d09aaa943d715231ad42d80f8cd4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 5428 bytes
font_01_sfnt_off0001376c.bin
5dc7fae7928b798addae7f55b51c77f5aebc4afbec0930f03f6090c5365dc939
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 11104 bytes