Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5318fead7de400…

MALICIOUS

PDF

40.6 KB Created: 2020-03-12 03:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fcfc12d7a5636a2e693e5960485e473c SHA-1: 723a72e480418485644f7197b6e6c71ca692efdd SHA-256: 1c5318fead7de400d5cfb090466fd7aedc8488ae17f092a2634a2c1231c035f3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a link farm, which is often used to distribute malware or engage in SEO spam. No scripts were extracted, limiting the analysis of direct payload execution.

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://ambtcex.com/uploads/1/3/0/7/130739287/130739287.html#pros+and+cons+of+gmo+foods+livestrong
    • http://www.thelivestreamteam.com/uploads/1/3/0/5/130538880/10f4c2cec99ddc2.pdf
    • http://websiteofawesomness.com/uploads/1/3/0/4/130476192/retawa.pdf
    • http://merchantadventures.com/uploads/1/3/0/2/130287243/korinevagi-subejaxexi-nalaxuvitopete.pdf
    • http://webmail.bugayinvestments.com/uploads/1/3/0/6/130604645/zorogekipisi.pdf
    • http://www.matthewschwartz.org/uploads/1/3/0/4/130436037/reromudijoledixigope.pdf
    • http://mopitmaid.com/uploads/1/3/0/7/130740265/rafoseririzur-rojij-jowujojosusefog-kamuminusor.pdf
    • http://my-bizco.com/uploads/1/3/0/5/130544703/subarefejiri-muxif.pdf
    • http://troop14holliston.com/uploads/1/3/0/5/130540477/6792806.pdf
    • http://aerialinnovationsllc.net/uploads/1/3/0/5/130539046/movekibomaw.pdf
    • http://www.trustworthypaintersvictoria.ca/uploads/1/3/0/6/130620704/xixigelakod_vilakigijifatog.pdf
    • http://componentcatalog.dev/uploads/1/3/0/8/130873843/5102971.pdf
    • http://www.theluxeinventory.com/uploads/1/3/0/4/130483299/daxowasidef.pdf
    • http://www.thirty-thoughts.com/uploads/1/3/0/6/130604598/silofaxa-bubuvawaseto-jetilu-rasirizuzaz.pdf
    • http://appexchangereviews.com/uploads/1/3/0/9/130969678/9472264.pdf
    • http://etuicollection.com/uploads/1/3/0/5/130590608/vazopebalo.pdf
    • http://marmiger.com/uploads/1/3/0/7/130774982/vumoxaj.pdf
    • http://www.cglewis.net/uploads/1/3/0/6/130639837/fobawobo.pdf
    • http://dmicreativemanagement.com/uploads/1/3/0/3/130324207/ritezeli.pdf
    • http://reeltv.net/uploads/1/3/0/2/130289063/8969681.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_off000074cd.bin
dc4b358187c9f79b32fc861a80befdd40f552fa59bbf2616404adeb4ccd27427
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 8380 bytes