Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de8f694614bb943…

MALICIOUS

PDF

37.0 KB Created: 2020-04-19 05:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed9b2884b86e591d25b447ac7899d67b SHA-1: 5ef62033a90eac18febc4bfe87daf2b737771534 SHA-256: 6de8f694614bb943372bbb1b5271e7761007216aa1c87312917239b761268c53
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. The document body, though heavily obfuscated, contains text related to 'Secretary of state nevada annual report' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the 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://sproosmen.com/uploads/1/3/1/3/131384201/131384201.html#secretary+of+state+nevada+annual+report
    • http://homeplusgmbh.com/uploads/1/3/0/6/130639019/vudixa_zedepamaxegeke_likorazapanu_gizorupinej.pdf
    • http://everetthomeinspections.net/uploads/1/3/0/6/130604397/latigiganexed.pdf
    • http://speakingofbirth.com/uploads/1/3/1/1/131164506/91ab1408d3e2.pdf
    • http://thedornedivision.com/uploads/1/3/0/8/130873978/d12114e6163d82.pdf
    • http://papergroupusa.com/uploads/1/3/0/7/130775245/vikawogarekol.pdf
    • http://zaidinplastering.com/uploads/1/3/1/3/131398333/punamag_netaputawumu_dobifamejan_tusosujaj.pdf
    • http://vinyldecorations.com/uploads/1/3/1/4/131452814/vodidomi.pdf
    • http://claraleelifesuccess.com/uploads/1/3/0/2/130270951/1f161a790c.pdf
    • http://writerkelseydanielle.com/uploads/1/3/0/7/130739934/vudeja-mubuwoxa-pafete-foxefu.pdf
    • http://ukcpioneerdays.com/uploads/1/3/0/3/130379147/xofulekerusavutepove.pdf
    • http://vjjewlery.com/uploads/1/3/0/6/130640046/6ba7070ca2c5.pdf
    • http://seashoreinvestments.com/uploads/1/3/0/6/130621131/bebuk-dezanibafexa-zobijurizeb-dexutitevi.pdf
    • http://kylejoeturner.com/uploads/1/3/0/5/130590410/bitaxebexotasij.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_off00006a3a.bin
80b99ca0240d77cd0a564c212ef8654dcbcc266592413dd6d3ea6c2a90ba1f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 7520 bytes

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