Malicious PDF — malware analysis report

Static analysis result for SHA-256 13273ce5a145e422…

MALICIOUS

PDF

36.1 KB Created: 2020-04-12 07:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3e70bce069fae345d162fd7f2312a75b SHA-1: 0a9a6f13bda328f9cbb491109a2dc56c765a98e2 SHA-256: 13273ce5a145e42297b27b48ddd7a662894f0dd2ea8f3373c892712416137974
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a tactic to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the extensive list of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://radiantdiamondscomic.com/uploads/1/3/1/4/131408439/131408439.html#d+flat+major+scale+bass+clef
    • http://federatedchurchofburlingame.com/uploads/1/3/0/7/130775537/4214276.pdf
    • http://sparklesquadaz.com/uploads/1/3/1/4/131483588/palelexosun.pdf
    • http://bmsmarket.com/uploads/1/3/1/4/131483170/da674e220727d6.pdf
    • http://southboundpct.com/uploads/1/3/0/6/130622007/de67d005a827.pdf
    • http://neuropsychologiemontreal.com/uploads/1/3/0/6/130603855/bitizotorej.pdf
    • http://thevegarab.com/uploads/1/3/1/4/131482991/08d81a0086a97.pdf
    • http://cdconggiaovietnamvic.org/uploads/1/3/0/2/130289177/bagegevijijup.pdf
    • http://retirementadvisorygroup.net/uploads/1/3/0/4/130435561/vewomasidupuxuxinujo.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_off00006667.bin
440d486e4c185babf06b99bb3fc923ca97e50fcd390c72951894edf4f002e3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6667 7660 bytes

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