Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c245f4b203b177…

MALICIOUS

PDF

42.4 KB Created: 2020-04-12 17:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dcaca500a7a1da51720172eb91d63476 SHA-1: 31451242fdae20683505118a57976f031fe28aa8 SHA-256: 76c245f4b203b177fc3c86d8e16678537c4d60fc05f43b26cd3a918aa2f21a25
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many with numeric slugs, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that appears to be part of this pattern. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a large number of external links, pointing towards a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rockandrowel.com/uploads/1/3/1/4/131408864/131408864.html#mensa+iq+test+example+pdf
    • http://fluttersplutter.com/uploads/1/3/1/4/131406381/a273c68a4f.pdf
    • http://easternfiltration.com/uploads/1/3/0/2/130289690/pijenulupakas_fikovupavux.pdf
    • http://thearabichouse.net/uploads/1/3/0/3/130324005/8415230.pdf
    • http://roofingpros-stpetersburg.com/uploads/1/3/1/3/131384503/7517853.pdf
    • http://drdanielmalcolmbarfield.com/uploads/1/3/1/3/131383766/fuwuvi.pdf
    • http://lamarelementarycounselor.com/uploads/1/3/1/3/131383621/luzivinar-xodogowidazupij-sonupa-xilamoradobol.pdf
    • http://paste888.com/uploads/1/3/0/2/130289220/bujaj_xobegadana.pdf
    • http://krgservicecorp.com/uploads/1/3/0/9/130969539/supokajupeworeziwer.pdf
    • http://golfclubraks.com/uploads/1/3/1/4/131406841/wunereviwez_tavavafuxamen_vozuveziferag_dasesabal.pdf
    • http://flyyogastudio.com/uploads/1/3/1/4/131438844/e4c839a417e9a4.pdf
    • http://wyattdistillery.com/uploads/1/3/0/3/130323723/kujojibola.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_off00007dc9.bin
56082c01b2d0ae3f462fff86db6a084d05bb692e8a11dc861c05f0641180b501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 8372 bytes

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