Malicious PDF — malware analysis report

Static analysis result for SHA-256 77347cf0ce30fb2b…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 08:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6155d0b52293356081afdb7bc0a954ba SHA-1: 75966cfc56a08a4876c031b814616def2cf53355 SHA-256: 77347cf0ce30fb2b7a51fc7d3e749d58714faba848a6bdd6689e422dc76b1107
156 Risk Score

Malware Insights

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

The PDF file contains a link farm and an embedded URL pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to Android software, suggesting a lure for potentially malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9506

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/aws?utm_term=kingroot+apk+for+android+6.+0.+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454048/normal_5fa401f9caacd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f9a505fd4756.pdfIn PDF document text
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/fisosulejafebeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_5fa7895a7399a.pdfIn PDF document text
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/pubezopaja.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/wunojipu/tibivoliro.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/animal_quiz_diva_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/33519037829.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/84376230654.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/automated_storage_and_retrieval_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/area_of_shaded_region_formula.pdfIn 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 5412 bytes
SHA-256: 252d9c3658a23af6fdb9a02ed58eff39e7a28969b33c92c325054a87ff60ef98
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10676 bytes
SHA-256: 6dcb5e25c76b8fab2cc9373697ea621e78f5f272ca5b30f37c524694e16e288a

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