Malicious PDF — malware analysis report

Static analysis result for SHA-256 752bc70cf3203ab8…

MALICIOUS

PDF

33.8 KB Created: 2020-04-15 16:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 078f9b36ab46af2709a03f8e4ab4c01c SHA-1: bc1f1de179b23bfc9b11432d514b1262ff1cc39a SHA-256: 752bc70cf3203ab89c5cfed343c9a0fe41e0134f2c793e143f1c6a93496e2da8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ndtasanantonio.org/uploads/1/3/0/5/130590531/130590531.html#walch+integrated+math+2+answer+key
    • http://virtualpriest.org/uploads/1/3/1/4/131453201/xarotakifomaletevuma.pdf
    • http://lemonfoodservice.net/uploads/1/3/0/4/130483230/a09ade58671d1.pdf
    • http://katiengel.com/uploads/1/3/0/7/130776253/8941b.pdf
    • http://coedgeekgirlslumberparty.com/uploads/1/3/0/2/130287413/deverilodizulani.pdf
    • http://tmgspeed.com/uploads/1/3/1/4/131438177/5284459.pdf
    • http://610zane.com/uploads/1/3/0/7/130775750/musaxojewuvegovi.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_off00005d60.bin
9f7d61dd428437e482193dd329b5981691d67bcbb4a66dd20879fc346bcc7917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D60 7804 bytes

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