Malicious PDF — malware analysis report

Static analysis result for SHA-256 846eb9904889b3df…

MALICIOUS

PDF

69.0 KB Created: 2020-11-28 12:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8ba442abb27dc0cb644b79f683cfd6bf SHA-1: 1d899cea5e8e6727b8e1adc79e8d327faa2bc765 SHA-256: 846eb9904889b3dffe447baf1e54933ba2b36bf37409b1f139fd3c34dd335fb5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'traffine.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/123?utm_term=how+to+make+a+toga+for+a+girl PDF link annotation
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/sotoxatisamazaruse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f95f376b3a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f915367cd273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f997554b6752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f89d080a9927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f8e1e0cc3790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f9baa0c29587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5f9fe58ca23cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_5fb5192f4d804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fae469765d1d.pdfIn PDF document text
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/vinarimaxefisalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fad814ebe2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5f97681ca857e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5028 bytes
SHA-256: 75f3f842ee918d352952dedd8ec4f49f1be1a83bdb4d7ec429d8e1108b804c06
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 10300 bytes
SHA-256: 7d0647fbf90e3671f72574c09ed4e8f099f5e0265c4a8b8a8aafdbb67930e24e

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