Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8195b45316678ba…

MALICIOUS

PDF

38.7 KB Created: 2020-03-29 02:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34f20962a7c86fa192368daaab3e236b SHA-1: 87eaaedf30ef410163d371ae88834921a0d0690d SHA-256: f8195b45316678ba33b9ba7434ce4eaed19ab25d7e48ac15120b7b6ecd14b6df
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body is largely unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

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://sweetestdreams.org/uploads/1/3/0/2/130270776/130270776.html#blue+and+cream+dapple+dachshund+for+sale
    • http://www.nextbuildingforum.com/uploads/1/3/0/8/130873728/17230.pdf
    • http://consumerdirectads.com/uploads/1/3/0/5/130588957/2372073.pdf
    • http://drpind.com/uploads/1/3/0/2/130289542/dafd472.pdf
    • http://triosimplantdentallab.com/uploads/1/3/0/5/130550775/radaguniwubotewiti.pdf
    • http://1287pictures.com/uploads/1/3/0/4/130435619/f0c4e4.pdf
    • http://www.sunshinehmnj.com/uploads/1/3/0/9/130968985/mopelikosuporiz-zofatiw-vonig.pdf
    • http://matilijajuniorhighpto.org/uploads/1/3/0/5/130544938/5225024.pdf
    • http://moongsushi.online/uploads/1/3/0/6/130639019/f54455.pdf
    • http://www.reclaimthemildurabasehospital.org/uploads/1/3/0/6/130640163/a14a7a8.pdf
    • http://dlockhartphotography.com/uploads/1/3/0/6/130621282/5fb284cbb467.pdf
    • http://streamacoach.com/uploads/1/3/0/6/130604803/da71a7.pdf
    • http://bikeladyslc.com/uploads/1/3/0/5/130589264/gogod.pdf
    • http://forkthecommons.com/uploads/1/3/0/2/130289792/lexikenas_vitesosanavem_kavivije_vositilenabebaj.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_off00006db9.bin
ff3b1fb6a8a3f4f19a84251248eb3dd45b8c209451b8c1c412c005253866705a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 8304 bytes

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