Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91b38d9273e04bd…

MALICIOUS

PDF

72.3 KB Created: 2020-11-25 23:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d5f66f515afb74e19de387e4429031e1 SHA-1: 97fa136edd5be5ce8c5106f950f8f69ae0d1af98 SHA-256: d91b38d9273e04bd8bc3145e90eb8e6185617a9acbce39cb2004e0e44b5a9ff1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafftec.ru', suggesting a phishing or malware distribution attempt. The presence of embedded PDF links, including one to 's3.amazonaws.com/juvetaso/sibesixexazafef.pdf', further supports this. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafftec.ru/strik?utm_term=holiday+time+christmas+tree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5f99cde22796b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f9c89816527a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5f9b18df1eca5.pdfIn PDF document text
    • https://rasagarus.weebly.com/uploads/1/3/4/4/134452949/01bfc7ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f9dc75baa3dc.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/juvetaso/sibesixexazafef.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/announce_caller_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/critical_gender_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/15216065707.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/4571387182.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/3d_animation_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/88797672946.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/gossip_girl_episode_guide_season_5.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/rulaxupinazelozar.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 5240 bytes
SHA-256: 8745cc4cf1a19ef4041e2fef8a284602be8999db0270f82d969ef47f19a34788
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10428 bytes
SHA-256: dad464d225779180640099cb6b5b9c7c5c0ee8bac738322a706dcd9984c2f0da

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