Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0746f869e6e61c2…

MALICIOUS

PDF

34.2 KB Created: 2020-04-08 06:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2fff90759d42856e74685cfb47529c56 SHA-1: 649abe82561c30d664f136ea0d9517b0b51e8fb6 SHA-256: a0746f869e6e61c267db00230522496e0dfc46b32a01d7a07c91c73d5e7716d6
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, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to drive traffic or host malicious content. The document body, though heavily obfuscated, contains references to educational materials and the authoring application 'wkhtmltopdf', suggesting a deceptive lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://alldomesticcustomcleaning.com/uploads/1/3/0/4/130476053/130476053.html#pearson+environmental+science+textbook+online
    • http://mlcvideos.com/uploads/1/3/0/6/130621128/ddb415825fbb96.pdf
    • http://kainna.net/uploads/1/3/0/2/130289227/wofejakali-vifap-fuxuxixutepug-pilenotav.pdf
    • http://efmindia.org/uploads/1/3/0/6/130604838/ximekubenokefenuzizu.pdf
    • http://panachedesignonline.com/uploads/1/3/0/6/130604541/wafelor.pdf
    • http://my-lakeview.com/uploads/1/3/1/3/131383823/butoj-tonabobumubap-tetiw-jemekazakoleg.pdf
    • http://regenesismagazine.net/uploads/1/3/0/5/130588594/6296b.pdf
    • http://lookinggoodaz.org/uploads/1/3/1/3/131380251/lixaboxeximobenewuri.pdf
    • http://noitedosamba.com/uploads/1/3/0/7/130739678/winatukaluwazasosu.pdf
    • http://investcloudservices.com/uploads/1/3/0/4/130478772/54abaaa62da57.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_off00005ecb.bin
dd3413c5bf26b7e9e9b1e3c64d0ec4a1bfcfc01d06245135208a62c575f259bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 7456 bytes

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