Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b29b6db380fca…

MALICIOUS

PDF

72.9 KB Created: 2020-12-19 15:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 128c0a25769178abf6c2cf8aa76496a1 SHA-1: ddb572fe5075702c90da2c244fcd83a76ca52d40 SHA-256: cf9b29b6db380fcaec0b6a618a8a7e0627ba7f035f6c343b45124842acbe3554
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'trafffe.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to exploit vulnerabilities or trick users into visiting malicious links.

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://trafffe.ru/aws?utm_term=international+accounting+standards+audit+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5f99b35785971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5f9c6cb10a3ee.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/vukefovudipogal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_5fd95820e01d7.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/6721930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f9f9412ea676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4af9236c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc72731eddbb05c6893b1dd/t/5fd67e945488895576afebbd/1607892628548/chipotle_uk_nutrition_information.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ec032cf09257bd856c41/t/5fd5fdb472b1137fa96b50e6/1607859636819/37784608281.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/coleman_tent_trailers_floor_plans.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37885b7bc966055e0d98/t/5fdd7d2f7f4e6a33670cff2a/1608351027331/33361541691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf6ceb4-3713-4826-8a1b-3b2316adff08/wahl_guide_combs_sizes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38e39104edf1d7791b9fc/t/5fcf3f840ff3944fc5566a73/1607417732085/zaworogomiwiloveb.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/free_letterhead_template_design.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 5180 bytes
SHA-256: ca78d39f22dbca8402d7b9d582dd6da55e574f30f3d9f0678aec2c8c0d6bf16e
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10504 bytes
SHA-256: 5e4cee78a6cee5937ff3cb0b76b01685bd502bb92a91d68ca97cd495d7753293

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