Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b102b9200fce5c6…

MALICIOUS

PDF

30.2 KB Created: 2020-03-30 06:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6d3ae1f6f85bfd61355a3cd4459f805b SHA-1: 52c98987ba4eef7ff885211fd96f5d6c1c70d3f9 SHA-256: 5b102b9200fce5c6f1050dde1bd6e18396b164522fbde456cb9c5a1c359fa1ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content or perform SEO manipulation. The ML classifier also flagged this PDF as malicious with high confidence.

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://nationalriskmanagementgroup.com/uploads/1/3/0/8/130813957/130813957.html#the+thorn+birds+the+missing+years+season+1+episode+6
    • http://coachpaulaconnects.com/uploads/1/3/0/7/130740510/waxojivon-dedafi-fufes.pdf
    • http://linda-schubert.com/uploads/1/3/0/8/130813643/wavekipeluzika.pdf
    • http://2bepotencialhumano.com/uploads/1/3/0/4/130488223/c316714.pdf
    • http://mariettasquarefarmersmarket.net/uploads/1/3/0/7/130775977/5838362.pdf
    • http://southeastasiastrategies.com/uploads/1/3/0/7/130775990/karaduvex.pdf
    • http://mlhubbard.com/uploads/1/3/0/2/130288430/xunalekizawegov-fotojafavatovi.pdf
    • http://webdisk.kortomomolu.com/uploads/1/3/0/2/130291658/kabagupevas.pdf
    • http://scetou.com/uploads/1/3/0/6/130604312/8923261.pdf
    • http://vvbfashion.com/uploads/1/3/0/4/130476215/82166af7f.pdf
    • http://dev.americameditating.org/uploads/1/3/1/4/131453137/lezisarosifud.pdf
    • http://mccoychapelchurch.com/uploads/1/3/0/6/130605516/dojafem_felide.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_off00005198.bin
83474ba3c10c2f39037f1a8ad05abf5b54cf6ae28d1e4d13080490d3b5955093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5198 6416 bytes

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