Malicious PDF — malware analysis report

Static analysis result for SHA-256 522c879493dc62d9…

MALICIOUS

PDF

45.0 KB Created: 2020-04-07 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: 0dacd258a8bbfed5417bed3654ba842f SHA-1: 1df956a2dd785fe535f86c66c17e61a1abf4890e SHA-256: 522c879493dc62d96c3c00eb426e6547126696fb52bb4277e56b719850f06467
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text but also includes the URL http://holoholofuntravel.com/uploads/1/3/1/4/131438629/131438629.html#ba%C5%9Faba%C5%9F+noktas%C4%B1+nedir, which is also present in the heuristics. The primary attack pattern involves directing users to a network of suspicious URLs.

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://holoholofuntravel.com/uploads/1/3/1/4/131438629/131438629.html#ba%C5%9Faba%C5%9F+noktas%C4%B1+nedir
    • http://osscomp.com/uploads/1/3/0/7/130775465/zivoruripowat.pdf
    • http://lexanimi.com/uploads/1/3/0/5/130550830/wanumuremigidusumok.pdf
    • http://alliance.life/uploads/1/3/1/3/131380066/bdc1d4.pdf
    • http://itemdisk.com/uploads/1/3/0/2/130272505/7ad25e.pdf
    • http://lavieenrosesana.com/uploads/1/3/0/6/130620807/8112936.pdf
    • http://daveformaine.org/uploads/1/3/1/4/131437333/fba1b0b66.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_off000080fd.bin
0fd1f5bdb1c03f6e9e939790d99716f4183b1938b5cfa945741ba5373c857e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 10708 bytes

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