Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc4e59d66c5bf2…

MALICIOUS

PDF

78.5 KB Created: 2020-04-10 23:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b09f7dc19d9088217e2f11b7cdb13042 SHA-1: b86e4954877b166d04ef442c45cbb2f9c8418eb6 SHA-256: 6acc4e59d66c5bf2e595055e71431c98608853906a7e6ea423fd2f93dd727fd2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment. No scripts were extracted, but the structure and heuristics indicate a likely attempt to manipulate search engine results or distribute further malicious payloads via the linked documents.

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://qualitycareafh.com/uploads/1/3/0/9/130969279/130969279.html#forced+march+pathfinder
    • http://timesharerevolution.com/uploads/1/3/1/4/131409474/debuguweluroku_tiziwurejuz_nigutat_mokefitugum.pdf
    • http://artdeptwebsite.net/uploads/1/3/0/9/130969678/4224801.pdf
    • http://vetforpetnet.net/uploads/1/3/0/9/130968968/c00aa884f005a.pdf
    • http://knowledgeuniversity.org/uploads/1/3/0/8/130813649/4294640.pdf
    • http://algonquinenvironmental.com/uploads/1/3/1/4/131407625/7454747.pdf
    • http://urbannomaddiveadventures.com/uploads/1/3/1/4/131438587/nikebekifisede.pdf
    • http://rpmhomedelivery.com/uploads/1/3/1/1/131164278/75d7f.pdf
    • http://thorntonfences.com/uploads/1/3/1/4/131453421/tuguvojuxenisi.pdf
    • http://shelfinfo.org/uploads/1/3/0/6/130639995/4dfb5ec61.pdf
    • http://simpleyetcute.com/uploads/1/3/0/6/130639428/1a70b32f460e.pdf
    • http://charleschristiangolf.com/uploads/1/3/0/8/130815013/nebavukuloru-bulixafesixus-faxedew-roris.pdf
    • http://tanveerzamani.com/uploads/1/3/0/6/130604016/solezerawej.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_off00010c21.bin
594b3202e84bf14b57f943f9ef9da9944cbd150271cb5052b279c0f0076fea24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 8384 bytes

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