Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7095364a9f4525…

MALICIOUS

PDF

51.0 KB Created: 2020-04-19 15:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a3025ce39273dea572eaa20d8871bf75 SHA-1: 0c5b54ef665779fadd0a4f89ceea298016a1c752 SHA-256: 0c7095364a9f45250e2468f495dde0b46f4b6b867184b75eefb7e3785a8be296
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be dynamically generated and point to other PDFs. This suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to drive traffic to external sites.

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://echoco.org/uploads/1/3/1/0/131069764/131069764.html#rational+fasting+free+pdf
    • http://botanicahomebody.com/uploads/1/3/0/2/130288926/4aa03e28e6f5c8.pdf
    • http://juliedmanning.com/uploads/1/3/0/6/130639259/rifagilixoxovigowuk.pdf
    • http://lozera.cz/uploads/1/3/0/9/130969837/400485.pdf
    • http://marthassong.org/uploads/1/3/0/2/130273789/zolanu-folixadedesevux-vewezajatelapur-ledadomobupu.pdf
    • http://mylifebuilder.org/uploads/1/3/0/6/130604030/4688490.pdf
    • http://saladextraveganza.com/uploads/1/3/0/6/130639334/d86c57cdc.pdf
    • http://qualitytouchhealthcare.com/uploads/1/3/0/7/130776603/7da0e49178c5.pdf
    • http://bakkelundbackpackers.com/uploads/1/3/1/6/131606218/e7589d2028ad9e.pdf
    • http://tratodeviaje.es/uploads/1/3/0/9/130968921/xuxeka.pdf
    • http://hopetowing4.com/uploads/1/3/1/4/131407882/fifavox_viloruwaxovu_senalivo_remiritadav.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095f8.bin
16c81ee00f3753b002b6c84e19049cb8bbfaf73b649e84aaf0edd4621e9b32c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F8 8132 bytes
font_01_sfnt_off0000b54f.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 2596 bytes

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