Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76526820ad6989a…

MALICIOUS

PDF

40.9 KB Created: 2020-04-01 13:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c841490ba0bd7fe5bdaf27175fb2880 SHA-1: 3b43c95180401908e029b145de5d6333b0326798 SHA-256: b76526820ad6989a36feecec581d64d8ce25b92dbcdb08a83ef8f74f8955c3b1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary link points to 'http://neokundalini.org/uploads/1/3/0/6/130640078/130640078.html#como+trazar+lineas+paralelas+con+compas', which is part of a network of similar URLs hosted on various domains. This pattern suggests a link farm or SEO manipulation tactic, likely intended to direct users to malicious or deceptive content. The ML classifier also strongly flagged this PDF as malicious.

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://neokundalini.org/uploads/1/3/0/6/130640078/130640078.html#como+trazar+lineas+paralelas+con+compas
    • http://artfromaveganheart.com/uploads/1/3/0/6/130621805/nazofaso-samom.pdf
    • http://alfafencing.net/uploads/1/3/0/6/130622091/5869694.pdf
    • http://stringsoil.com/uploads/1/3/1/0/131069915/fofotinemaxoxosetove.pdf
    • http://www.cheshycheshy.com/uploads/1/3/0/6/130620567/woxomusebizireb.pdf
    • http://mta-sts.mail.windowsmanchester.com/uploads/1/3/0/9/130969689/5591442.pdf
    • http://sacredtees.com/uploads/1/3/0/9/130968915/duvidozikome_xosabis_mawodekigadi_bawiduv.pdf
    • http://raylaillaw.com/uploads/1/3/0/9/130969322/ribixuzuwasoju_zonagosafanaw.pdf
    • http://bodybarn.net/uploads/1/3/1/0/131071033/xisidi.pdf
    • http://ctruin.com/uploads/1/3/0/5/130588698/1cea0525d50987.pdf
    • http://williamsinspectionsllc.com/uploads/1/3/0/5/130588847/pifobulativuv.pdf
    • http://vredenburgwoodworking.com/uploads/1/3/0/5/130590278/3a9f0e86d66.pdf
    • http://evolbliss.com/uploads/1/3/0/5/130550756/9387861.pdf
    • http://triclubechelon.com/uploads/1/3/0/5/130590140/f60e039.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_off000075ab.bin
e095a5ee77069469931d0f48b4a7e6329a173695f0ca4ae99d683c0817f8d108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 9116 bytes

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