Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a7f19ebe451619…

MALICIOUS

PDF

40.1 KB Created: 2020-03-22 05:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2dfff3fed4a254a9786bee04380ab5a SHA-1: 0a41ef859edfd25f1f4cb582e49218554ea3debb SHA-256: f2a7f19ebe451619c30f541e0e8a85e792b5e8aa48fd4d697d330b14619dc442
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which are hosted on newly created domains and follow a pattern suggestive of a link farm. The document body, though partially corrupted, contains text related to a math book and the wkhtmltopdf tool, indicating a lure to disguise the malicious links. The primary attack pattern involves directing users to a network of potentially malicious websites through these embedded links.

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://plasticasequeira.net/uploads/1/3/1/0/131071240/131071240.html#libro+cove%C3%B1as+matematica+3+secundaria+resuelto
    • http://phoenixconsulting.co/uploads/1/3/0/7/130739780/senonomel-redofunu.pdf
    • http://hooverleadership.org/uploads/1/3/0/7/130775606/wotelab.pdf
    • http://www.nuclearproclean.com/uploads/1/3/0/7/130740087/fitabopin.pdf
    • http://printfinishingshop.com/uploads/1/3/0/5/130588573/tivosoxajev.pdf
    • http://illuminationofself.com/uploads/1/3/0/5/130589135/e4864758915.pdf
    • http://openxform.org/uploads/1/3/0/5/130551349/456567.pdf
    • http://judgeammendola.com/uploads/1/3/0/7/130740258/duvawumiduxijo-wafowimejika-tosuzaseme.pdf
    • http://bolderlegal.com/uploads/1/3/0/4/130483710/95938.pdf
    • http://quantummethods.org/uploads/1/3/0/6/130621283/foxonano-pefofov-rigarunit-tudebexoj.pdf
    • http://enablingenvironments.info/uploads/1/3/0/7/130775107/mapoxiwiwud.pdf
    • http://www.clareellis.com/uploads/1/3/0/2/130289613/8276641.pdf
    • http://chocolatelikeafox.com/uploads/1/3/0/5/130551692/4547541.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_off00006f7f.bin
f6edfc521283edd076d45916437a16b316b8f4aec3bb3b2a70affdde0e68ff4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 9356 bytes

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