Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db37d803602792f…

MALICIOUS

PDF

36.6 KB Created: 2020-04-06 09:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5f509110c39a777d9361f3e4c4abfac2 SHA-1: ff38ba294e43cd3fbd779e93976bca765f189772 SHA-256: 0db37d803602792f63006734c833cabc9a4900b5b8e72c89825a25d8f27ddad2
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 other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content, likely intended to trick users into downloading further malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://redrockwoodworks.net/uploads/1/3/0/5/130544090/130544090.html#experience+human+development+13th+edition+free+pdf
    • http://usmgsol.com/uploads/1/3/0/5/130539923/5786089.pdf
    • http://thelegacybandandshow.com/uploads/1/3/0/5/130543874/efbf748.pdf
    • http://blackmarketvapeslc.com/uploads/1/3/1/4/131438692/8085635.pdf
    • http://seniormedica24.pl/uploads/1/3/0/6/130639365/karixamo_wuwewafo_nafivupod.pdf
    • http://royalbridalus.com/uploads/1/3/0/6/130640032/zezige.pdf
    • http://virtubel.com/uploads/1/3/0/6/130639241/4011121.pdf
    • http://travelandthrift.com/uploads/1/3/0/5/130550895/revigefekexuxuladipo.pdf
    • http://offertgranskning.se/uploads/1/3/0/4/130483783/marezanatew.pdf
    • http://irishforumforgynaecology.com/uploads/1/3/1/3/131380171/828b2.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_off00006616.bin
c3e561e66f2111bc4ab19556acd5d750f2821e20d9eeb1eb272e609ada645072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 8276 bytes

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