Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e28b61ac5c32fe…

MALICIOUS

PDF

37.9 KB Created: 2020-03-21 02:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33970fa9547fbf10d49f0d5959b2daf4 SHA-1: 3b73e515c211d8ffa6d363be9a4ad78c93e57c31 SHA-256: 88e28b61ac5c32fe7470b983035e34e98f22bcb4156f41afd25faeec9873c08f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with the primary URL pointing to a guide on filling out a clinical history. This suggests a social engineering tactic to drive traffic to potentially malicious or spam-related websites. The ML classifier strongly supports the malicious nature of this PDF.

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://everestdobie.com/uploads/1/3/1/1/131164486/131164486.html#como+llenar+una+historia+clinica+de+enfermeria
    • http://www.happydogwalker.net/uploads/1/3/0/4/130435577/lepig-loseko.pdf
    • http://www.desertcruisersoflasvegas.club/uploads/1/3/0/4/130483741/337268.pdf
    • http://neilgeyette.com/uploads/1/3/0/4/130436049/7ac9cce933.pdf
    • http://www.eaglehvac.org/uploads/1/3/0/8/130874289/5600652.pdf
    • http://mail.decampstudios.com/uploads/1/3/0/6/130639440/totitixeponoganipat.pdf
    • http://www.surveyswipe.com/uploads/1/3/1/0/131070330/a8698823f78346.pdf
    • http://beyourbe.com/uploads/1/3/0/4/130483550/bibipekezapebuso.pdf
    • http://globalmoneylink.biz/uploads/1/3/0/8/130874128/9603905.pdf
    • http://outdoordistrictco.com/uploads/1/3/1/1/131164033/lunewevapota.pdf
    • http://alicezhouilc.com/uploads/1/3/0/4/130479472/486a5e3b.pdf
    • http://thewhyissue.com/uploads/1/3/0/6/130605107/1ec22337b.pdf
    • http://www.hydesportswear.com/uploads/1/3/0/6/130621439/vuvexuzegi.pdf
    • http://adsgroup-wines-food.com/uploads/1/3/0/6/130621355/6877902.pdf
    • http://mx.santafebrickandpatio.com/uploads/1/3/0/2/130288334/dofuranovonuduxam.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_off0000691a.bin
0c76e916e28061a6454c23ac9572d499b80615efd4db972fe805c6efebc505d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691A 8776 bytes

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