Malicious PDF — malware analysis report

Static analysis result for SHA-256 609bba55f8f11f2a…

MALICIOUS

PDF

35.9 KB Created: 2020-04-04 13:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c804f85786c691788a5398cb987fe50 SHA-1: df90cb28502d5e55ee06eef4ebc60f50a69aa2e2 SHA-256: 609bba55f8f11f2a85d239212696ace7c76bcd021ef4392195ac2c59998eefa2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution network. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dominicusscott.com/uploads/1/3/1/3/131380175/131380175.html#ejercicios+preposiciones+y+conjunciones+primaria
    • http://oasissupplyco.com/uploads/1/3/0/6/130604554/4882522.pdf
    • http://jcitheimagemakers.com/uploads/1/3/0/7/130739218/gesabaxemazamilener.pdf
    • http://crchupacabraproject.com/uploads/1/3/0/3/130323295/sevitikifotefetiludu.pdf
    • http://gaymeonhaters.com/uploads/1/3/0/3/130323934/4031434.pdf
    • http://keeptotheroad.com/uploads/1/3/0/2/130291582/madabadelido.pdf
    • http://plasteredonline.com/uploads/1/3/0/7/130739004/wuwikogedoxarej-bodasufuw.pdf
    • http://metoodartmouth.com/uploads/1/3/0/3/130379155/3fabf238453.pdf
    • http://berdoli.com/uploads/1/3/0/7/130775660/menoboz.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_off000061a5.bin
e742385f0f1126afe06e570582e429789bb2c87f323de93b3301e5656ea17c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 9188 bytes

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