Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0664e985f98da0…

MALICIOUS

PDF

34.5 KB Created: 2020-06-15 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1350d1004b904b322cbe2d2969cf2693 SHA-1: d90d37e7247c1cb2b98f84f677721785c80a6bcc SHA-256: 8c0664e985f98da07fa8f7f95b61c316020558400976beecfc2abbc663a26423
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this document as malicious with high confidence. The primary attack pattern appears to be a link farm designed to direct users to a large collection of documents, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marengineering.net/uploads/1/3/2/6/132680937/132680937.html#gate+2014+cse+books+pdf
    • http://criticalmoments.org/uploads/1/3/0/2/130288506/5924697.pdf
    • http://summerhouseco.net/uploads/1/3/0/5/130588811/966162.pdf
    • http://fitnessfixx.org/uploads/1/3/0/8/130814308/dibojogujija.pdf
    • http://representacoesanttunes.com/uploads/1/3/0/6/130621033/8938897.pdf
    • http://gettingreadyfor100.com/uploads/1/3/0/8/130874591/7837150.pdf
    • http://myfocusedu.com/uploads/1/3/0/4/130476146/lawuneja.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_off0000581b.bin
c8a52385b8b29251bd9e54e68139370b7108e630bfa1897a3283bbbc38a2a118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581B 12028 bytes

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