Malicious PDF — malware analysis report

Static analysis result for SHA-256 188724e2fcbfd528…

MALICIOUS

PDF

29.8 KB Created: 2020-04-11 04:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5fcb4d4d4d4cf3e0f441c5192fec1536 SHA-1: 565fa485dbb313e0c75e7c3d8de3688f479adf05 SHA-256: 188724e2fcbfd528626f4b1a6fc61f4c968c716e20001936e4e9f833e4ce15b1
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rehphotography.org/uploads/1/3/0/8/130814308/130814308.html#fnaf+1+files
    • http://myessentialessences.com/uploads/1/3/0/7/130739885/a09d11c4cc.pdf
    • http://cowboycalendars.com/uploads/1/3/0/7/130776592/7843550.pdf
    • http://chironetics.com/uploads/1/3/1/1/131164260/29a222c94.pdf
    • http://jesuslovesyougiftshop.com/uploads/1/3/0/3/130313293/9737002.pdf
    • http://250efiequipment.com/uploads/1/3/0/7/130775986/b8da57014d9a1e.pdf
    • http://cuttingedgemanna.org/uploads/1/3/0/7/130738951/bixusepilusimer.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_off00004d26.bin
78d2e39ce4af8a396ae262c2014f3b1dfd8211c1074c339f406e3fe2c1cb1723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D26 7528 bytes

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