Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec1caf1d58d30b1…

MALICIOUS

PDF

58.0 KB Created: 2020-04-18 19:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7bdc8ceec4d0b15ff22d3e7a90522668 SHA-1: 172542ccc510d675b0ae74f456607ec664148b4f SHA-256: 6ec1caf1d58d30b1a7b4f1b0a59c3a3329eaba5bf46a5c7e90ab1b691448bd5d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document is designed as a screenshot lure, presenting itself as a Cessna 210 manual to entice users to click a link. The linked URL redirects to a PDF file, which is part of a larger farm of 18 SEO-optimized PDF links hosted across multiple domains. The ML classifier strongly indicates maliciousness, and the structure suggests a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 57 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jbccommercialplumbing.com/uploads/1/3/0/5/130539223/130539223.html#cessna+210+manual+pdf
    • http://velocehelicopters.com/uploads/1/3/0/8/130874669/kegagubasiv.pdf
    • http://dusd-cte.net/uploads/1/3/1/3/131379194/ecbeba45f4bbd.pdf
    • http://schaepergoalkeeping.com/uploads/1/3/1/3/131384025/ce25b11e0e8.pdf
    • http://ervingfamilyreunionevents.com/uploads/1/3/0/3/130313440/5ae17f9819617.pdf
    • http://optshoppers.com/uploads/1/3/0/4/130435729/c1edd91a9289.pdf
    • http://aceboytennis.com/uploads/1/3/0/2/130292110/fogef-rudarimuwene.pdf
    • http://sophieportolio.com/uploads/1/3/1/3/131382406/da48b2.pdf
    • http://bahiserv.com/uploads/1/3/0/6/130621896/200b5.pdf
    • http://mail.cleartheland.com/uploads/1/3/1/4/131453706/mitipobivazu.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_off0000c774.bin
f30269f5aa6beb8a164cf9cfcb715efbd5a5dc1b14f43b64784e9204a4e7ba53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 4960 bytes

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