Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f08ab5225bf5dc9…

MALICIOUS

PDF

35.3 KB Created: 2020-04-18 03:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2965056df55ae1a75d8dcc52fe166b3d SHA-1: 20a07f6a2eb3087d4891bce0806c0a2a054b64dd SHA-256: 6f08ab5225bf5dc9ad07638aa631c5a997c56a5d6b3103642dc87307592f4edb
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, pointing to various domains. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a coordinated effort to direct users to potentially malicious content. No scripts were extracted, but the sheer volume of external links points to a content-distribution or SEO-spam attack.

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://txervrodeo.com/uploads/1/3/0/5/130551302/130551302.html#treasurer%27+s+report+pta
    • http://twistedtreeguy.com/uploads/1/3/0/7/130775032/paferawokagajim-gizetugavuz-joderu-jasele.pdf
    • http://calculikes.com/uploads/1/3/0/8/130813715/ea7620df70.pdf
    • http://mamarosagrill2go.com/uploads/1/3/1/4/131406569/pumolid-bulivejiva-wuzam.pdf
    • http://mrsrosatosclass.com/uploads/1/3/0/6/130620842/5e6758ebcbc7.pdf
    • http://altusgreen.com/uploads/1/3/1/4/131406154/rilawosokarep.pdf
    • http://mariedowyn.com/uploads/1/3/0/9/130969041/ff151b76.pdf
    • http://perhapstodaymini.org/uploads/1/3/0/7/130739351/zijanup.pdf
    • http://botargosantorini.com/uploads/1/3/1/0/131070751/f8ae0e6d0786.pdf
    • http://katrinahigham.com/uploads/1/3/1/3/131398220/gaferatifanopexepomo.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_off0000612d.bin
383795f585dd179a9d9f1f6097500b04661749d93382dc94ddcdf5ec62d19ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612D 7980 bytes

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