Malicious PDF — malware analysis report

Static analysis result for SHA-256 546dc29b1ac41805…

MALICIOUS

PDF

33.1 KB Created: 2020-06-15 20:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a2dc8509cb74c8991888cbb5cf0e3d SHA-1: 4c1fb65a80f9525c5ae6c857cbad1de33895aef1 SHA-256: 546dc29b1ac41805724237bc793e2a2c5f602379d3ee0f90220477881fe2824a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body mentions 'Hiv and aids pdf' and the file was generated by wkhtmltopdf, indicating it's likely a lure to drive traffic to these external sites. No scripts were extracted, but the heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to redirect users. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • 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
  • 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://simply-ang.com/uploads/1/3/0/8/130813033/130813033.html#hiv+and+aids+pdf
    • http://mta-sts.mx.hdpetsitters.com/uploads/1/3/0/9/130969910/8b363.pdf
    • http://carolineleuzinger.com/uploads/1/3/1/0/131070574/4897316.pdf
    • http://niblick2.com/uploads/1/3/1/6/131637357/rajuruwaso.pdf
    • http://rimasrl.facile.hosting/uploads/1/3/0/4/130492038/2679364.pdf
    • http://deutsh.travelmittelamerika.com/uploads/1/3/0/6/130639869/9663244.pdf
    • http://autodiscover.sascelledesigns.com/uploads/1/3/0/6/130604447/62e013.pdf
    • http://living-twenty.com/uploads/1/3/0/3/130313319/4849509.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_off00005a50.bin
12a09b420f414b347de9c5d9a7e7c23b7a55fdd095274b9859e90c7284ad59b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A50 9324 bytes

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