Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d0754d51cb7d6…

MALICIOUS

PDF

35.7 KB Created: 2020-03-20 14:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a2720ca4b5035d02e48f5d770b7daca7 SHA-1: a5e3f01b4fcda64f54383b417e30c61ad429c82d SHA-256: 3f6d0754d51cb7d6f4085ac2abb4a3ee351bacef87d401040d6557f0abcc9d1b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to coloring pages and the authoring application, which is likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://sauerlandhypotheek.nl/uploads/1/3/0/8/130815277/130815277.html#dibujos+para+colorear+de+lectura
    • http://wildflowersnetwork.com/uploads/1/3/0/2/130287281/gimiti.pdf
    • http://www.harvestbrae.com/uploads/1/3/0/8/130873951/1713391.pdf
    • http://cween.org/uploads/1/3/0/8/130874648/zanojopov-zawalokavifiweg-fokimogirabuvet-rulavesuf.pdf
    • http://drdanielmalcolmbarfield.com/uploads/1/3/0/3/130313196/e5a194.pdf
    • http://www.buddysberets.com/uploads/1/3/0/5/130588475/vemetamekitom_mororanesosuzi.pdf
    • http://smarterdarter.com/uploads/1/3/0/3/130323377/15adbe6.pdf
    • http://www.vpaus.com/uploads/1/3/0/5/130590092/1677520.pdf
    • http://aforu.co.uk/uploads/1/3/1/0/131069744/8265710.pdf
    • http://barringtonih.com/uploads/1/3/0/8/130874018/9927618.pdf
    • http://benearldrew.com/uploads/1/3/0/6/130605120/mavowivel-noxumibuvipu-nijoto-bodaradefener.pdf
    • http://stdio.xyz/uploads/1/3/0/4/130436494/1723581.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_off000063e0.bin
78a2417c2a5e88e610436d3e790805bffc8892dcc70eab6f57568c2d3e49ef8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 7688 bytes

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