Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f6c9f2cf2ea1bb…

MALICIOUS

PDF

36.1 KB Created: 2020-04-05 09:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 85f68a5360fad8fa555dfca91ee4d79b SHA-1: 998c8e2d8eb8f474bbfc3c408db6d25934cbc34b SHA-256: 65f6c9f2cf2ea1bb3fecb4194140606f582f0f10dae8b8722132701f5bbe8a47
104 Risk Score

Malware Insights

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

The PDF contains a lure for a free software download, which is a common tactic for distributing malware. The document embeds numerous links to external PDF files hosted on various domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://startfarming.eu/uploads/1/3/0/7/130776147/130776147.html#free+download+nitro+pro+for+windows+10+64+bit
    • http://makelemonade.shop/uploads/1/3/0/6/130621780/6220302.pdf
    • http://clamgram.com/uploads/1/3/0/6/130639863/rosunumasofi.pdf
    • http://notmonsier.com/uploads/1/3/0/2/130289561/442e0bddef7b3f5.pdf
    • http://eugenetyz.com/uploads/1/3/0/7/130738765/fejirugamuwefal.pdf
    • http://c3designsnsweets.com/uploads/1/3/0/6/130604919/4243683.pdf
    • http://hairbyalex29.com/uploads/1/3/0/6/130640139/dikarera.pdf
    • http://aerodronetechnologies.com/uploads/1/3/0/4/130476168/5800043.pdf
    • http://aimvend.com/uploads/1/3/0/7/130739029/cc388c902574e3.pdf
    • http://ninthdistrictdems.com/uploads/1/3/1/0/131070674/aadcab08a3d.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063db.bin
9d8ab48eb09d9c886cab675cabe46a27e05c3dd36d39e4037ef343f242e4e55a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 8204 bytes

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