Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da0fe0143bea864…

MALICIOUS

PDF

38.5 KB Created: 2020-06-06 11:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1faef17b928583f8c923db29cdd81ffc SHA-1: 1fe739ddcf4e518024f6fcd73fcd5fa42051bcb5 SHA-256: 5da0fe0143bea864adb055da580cb04dea66fcc790fd3621184d14f75d14b900
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links pointing to various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.janettepalser.co.uk/uploads/1/3/1/4/131437619/131437619.html#notice+rubik%2527+s+cube+4x4
    • http://alannahfrickerillustration.com/uploads/1/3/0/3/130324207/8655378.pdf
    • http://paintittucson.com/uploads/1/3/0/5/130538949/9bfb03997bf1.pdf
    • http://voxygen.de/uploads/1/3/0/6/130639557/392d6c87.pdf
    • http://aaronengland.org/uploads/1/3/0/6/130639350/6064500.pdf
    • http://kkperformance.net/uploads/1/3/1/1/131163638/6349184.pdf
    • http://mta-sts.mx.titanium-travel.com/uploads/1/3/1/3/131383921/3a8bbcc47a4ba.pdf
    • http://wwrva.com/uploads/1/3/0/7/130776452/kenajomimeni-riribixivunosi.pdf
    • http://heartlandchurchnetwork.net/uploads/1/3/1/6/131606039/kukaripawibivi.pdf
    • http://chocolatesmadebyme.com/uploads/1/3/0/4/130483909/1000425.pdf
    • http://hostmaster.janettepalser.co.uk/uploads/1/3/1/4/131437619/terms.html
    • http://hostmaster.janettepalser.co.uk/uploads/1/3/1/4/131437619/dmca.html
    • http://hostmaster.janettepalser.co.uk/uploads/1/3/1/4/131437619/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://suvasebe.files.wordpress.com/2020/06/jinebut.pdf
    • https://telomema.files.wordpress.com/2020/06/wujoxub.pdf
    • https://fotigegim.files.wordpress.com/2020/06/96553680484.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c91.bin
1bfd2b2f5bb3b856b6d27595ab7fbbe3c5a78825b0fec790aa9604206fa02bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C91 10012 bytes

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