Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbada15f78b7bbc…

MALICIOUS

PDF

67.4 KB Created: 2020-12-15 14:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ac6ca6116d2fb33caa0c48988467e1 SHA-1: d7b97d945ad4118a7c283aa7fb1200380499626d SHA-256: cfbada15f78b7bbc792e1daf82b470f70c1e37892e365c8f2f817b280a285924
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 heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to manipulate search engine results or redirect users to malicious sites. The embedded URL 'https://traffine.ru/aws?utm_term=airway+manual+pdf' further supports the idea of a lure or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=airway+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fc014ca4c82d.pdf
    • https://cdn-cms.f-static.net/uploads/4491437/normal_5fbe9d0043883.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fb8fb551bfa9.pdf
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/dopaninetagujalit.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd6cde4ad2b5.pdf
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/vigifu.pdf
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/a90ccb209.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc360b6bda9c57a97cdfd08/t/5fcf99a976f3eb1a46ea539b/1607440810133/bandi_biryani_review.pdf
    • https://static1.squarespace.com/static/5fc0e552ec917750a3d7e003/t/5fc138649ee0f32b877f1a0b/1606498404969/pokemon_mega_power_cheats_unlimited_mega_stone.pdf
    • https://static1.squarespace.com/static/5fc4cc83239b0722914a2f70/t/5fcfaef15c8977691e4755a3/1607446262706/bawagaveg.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5721e6d49a06bb88ee06/1606375202730/sten_gun_plans.pdf
    • https://static1.squarespace.com/static/5fc5451ac30a162e0c6f580a/t/5fc68e5bbc819f1cf4bd1116/1606848093887/81829738165.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4eb09d7936484084948d/1606373040321/46245773555.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7a.bin
da3a55b94a09c64de14529f171699ffc5f08f5b8890f63e21db1117b83bfa58f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 5192 bytes
font_01_sfnt_off0000e029.bin
56f94351676fcbd35931f4d0b858ee9ba56ec607a250d847fc126b8e6ebd5286
pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 9588 bytes