Malicious PDF — malware analysis report

Static analysis result for SHA-256 6796f2cb49f2e14d…

MALICIOUS

PDF

29.1 KB Created: 2020-04-06 14:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd7e1702c1218d753890b9dc0629ce70 SHA-1: b3f6827c224fc5b7193c412abdb68821a0d5d281 SHA-256: 6796f2cb49f2e14d81ae9224b866a8a4865b54ec4f08a4c25c495e95eb637245
156 Risk Score

Malware Insights

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

The PDF contains numerous external links disguised as search engine results for a pressure washer manual. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9534270-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9534270-0
  • 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://mayleesears.com/uploads/1/3/0/9/130968942/130968942.html#troy+bilt+pressure+washer+manual+2700
    • http://onthetrailarizona.com/uploads/1/3/0/6/130603905/kukorutijowan.pdf
    • http://sheansugar.com/uploads/1/3/0/8/130814178/1302423.pdf
    • http://jardinesexecutivetravel.com/uploads/1/3/1/4/131483053/70493.pdf
    • http://summithockeyacademy.com/uploads/1/3/1/4/131453255/sejevi.pdf
    • http://forthejoyofit.org/uploads/1/3/0/7/130738704/zakanoperatuzota.pdf
    • http://rocketamusements.net/uploads/1/3/1/4/131437418/0e43621b.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_off00004bda.bin
d7777eb5a7c713d93ab29353a988d4389c7f6d14ecbfeed3b18c43088f3e3c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BDA 7012 bytes

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