Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd72a3d8849c0b5…

MALICIOUS

PDF

31.3 KB Created: 2020-06-21 16:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc41e8c945b0ecc863efc72a5cec4556 SHA-1: 76fd65c729a822e4c5d9fa7b0a821050c5314dc0 SHA-256: 0fd72a3d8849c0b5627add048a6f8ae7e681490e8a3b67feeba5a50f1676655b
104 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mx.lpeditor.com/uploads/1/3/0/3/130379475/130379475.html#gerund+worksheet+with+answer+key
    • http://hostmaster.spoonit.co.uk/uploads/1/3/1/3/131379280/081ac2.pdf
    • http://dogdaysbrewing.com/uploads/1/3/1/4/131406934/9993238.pdf
    • http://mail.christianlanierlaw.net/uploads/1/3/0/5/130539305/217911.pdf
    • http://webmail.bostoncircusguild.com/uploads/1/3/0/7/130775085/wisuvuratazepug.pdf
    • http://prairiesmokeherb.com/uploads/1/3/0/5/130590537/tumokiguj.pdf
    • http://inspiredcreationsbyki.com/uploads/1/3/1/4/131437774/e1405.pdf
    • http://thegrassfield.com/uploads/1/3/0/9/130969652/pokega_dirilemav_libunufazime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ff9.bin
d0079992fc1c7292cc58b408bbe4baa40ea6ca6307ad012c1fc8f049d153eded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3FF9 5052 bytes
font_01_sfnt_off00005137.bin
33ee254a98ea5bc42ea1df6ebf9ed9c1be85b1857922d4bc63c7d2f14f9e58c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5137 9372 bytes

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