Malicious PDF — malware analysis report

Static analysis result for SHA-256 c941d1bfdd7d6fc6…

MALICIOUS

PDF

36.7 KB Created: 2020-04-11 08:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2236eb008c493a3fe1e901452ec32aee SHA-1: 48734c6c0776b981dcedc4a7741602de9ff1e895 SHA-256: c941d1bfdd7d6fc6f2c0d9425970665d7828eb2aafed0ec67c32c30d13a84014
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body text is heavily obfuscated and appears to be largely junk data, but it does contain one of the external URLs, suggesting an attempt to disguise the malicious links within otherwise unreadable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mta-sts.mx.letiziaiannaccone.com/uploads/1/3/1/6/131606197/131606197.html#oltremare+einaudi+sheet+music
    • http://vehicleloanusa.com/uploads/1/3/1/4/131438629/zegevekaw.pdf
    • http://winchestergardensherbal.com/uploads/1/3/0/2/130288861/zevemunokewaki.pdf
    • http://dirtyandtired.com/uploads/1/3/0/3/130313339/jigaserud-biwidagirigipe-wesoma.pdf
    • http://saveourschoolsvt.com/uploads/1/3/0/7/130776276/2103796.pdf
    • http://sattinhillfarm.com/uploads/1/3/0/6/130604420/9242a7c2.pdf
    • http://topteampainting.com/uploads/1/3/0/3/130323328/vusebupafu.pdf
    • http://colemancontractingllc.com/uploads/1/3/0/6/130639450/bagigized-zebaxejakulipa-zuludegajowado-taxuvugiwetew.pdf
    • http://colemancontractingllc.com/uploads/1/3/0/6/130639450/bagigized-zebaxej
    • 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_off0000651f.bin
8bd2aedc3c7cd8de4114daf7ab2250cde4aeecf1bb9b7df6669a9a07ec4fad8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651F 9128 bytes

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