Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f7f9f2914a3fc7…

MALICIOUS

PDF

87.6 KB Created: 2020-11-18 21:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a9bff30697c23c31a855858e0bb41b44 SHA-1: e86cebe3ffde4857c1eabe36d6671ef815fb4059 SHA-256: 12f7f9f2914a3fc7c1cf448edba8038f8dc7981538cd4069f33cca9b7a3887ff
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'trafffi.ru', which is likely a malicious domain used for hosting or redirecting to a payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of an external URI heuristic indicates an attempt to lead the user to a remote resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=protein+engineering+lecture+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f90d70c58cc3.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/6271120.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/kadijajaretapil-wakedujok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fad36924cb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fa723b0e0b90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/definition_of_bank_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203eb26e-dd3d-40a1-bcf2-50dd05af6132/gitij.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/chapter_9_study_guide_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/movodanex/300_meters_ft.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/8907927469.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/best_lessons_learned_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/fox_hills_cash_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/79036305019.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_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4712 bytes
SHA-256: 34d36f78c18d667898fc5f0e8faa3eee23d32332d32750cc99eae2fb66eb032e
font_01_sfnt_off00012c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 11092 bytes
SHA-256: 3c494ace02a00bb14d530c605038d318dce722be62b2c1cc8ef63c033443f7f1