Malicious PDF — malware analysis report

Static analysis result for SHA-256 efec2552874aa5b7…

MALICIOUS

PDF

35.5 KB Created: 2020-05-15 07:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 129ca01ca925f3b87f86c92feb9a7675 SHA-1: 27ac88be80821473649dfb204e5e45648500ec88 SHA-256: efec2552874aa5b715a1fcc7b05e0ab15806f82e1e16d1dabe5b3e3ccce5753f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://jesengineeringservices.com/uploads/1/3/1/3/131398472/131398472.html#jon+bernthal+punisher+reportedly+returning+to+mcu
    • http://babyboostco.com/uploads/1/3/0/3/130323588/f5f5db64bb0.pdf
    • http://nicoleforcouncil.com/uploads/1/3/1/3/131380606/7591d1a9e131.pdf
    • http://designandconquerhomes.com/uploads/1/3/1/6/131637362/9917692.pdf
    • http://brennanrestorations.com/uploads/1/3/0/7/130775017/rixilifafujijezetor.pdf
    • http://dropthemicagency.com/uploads/1/3/0/7/130776578/kadegonoreru.pdf
    • http://alpinepro1800.com/uploads/1/3/0/5/130589054/kafinedu-pusulef-lixebi-dowukuzupekis.pdf
    • http://solitudeandsilence.org/uploads/1/3/0/9/130969411/metorixoxegavawatof.pdf
    • http://forzagarage.net/uploads/1/3/1/0/131071315/322083.pdf
    • http://rileysanders.com/uploads/1/3/0/5/130588497/fivalatunosomofojos.pdf
    • http://disabilityresponse.com/uploads/1/3/1/4/131455543/3414590.pdf
    • http://journeytowanderlust.com/uploads/1/3/0/2/130272928/jopuriku.pdf
    • http://boulevardathens.org/uploads/1/3/0/6/130604495/deneduvunilibefos.pdf
    • http://robert-jennings.com/uploads/1/3/0/6/130639439/siredijirogewal.pdf
    • http://auveratech.net/uploads/1/3/0/9/130969931/kajomezevekiwa-redaladudir-detofotuzipoza.pdf
    • http://hopespringchurch.com/uploads/1/3/0/7/130739601/muzipatepekazokig.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_off00005cb8.bin
198fc6d0739c021071a3765d3e4d16dc8987205d14077249041ecfbcdd59c27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB8 10516 bytes

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