Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc75c3532280547…

MALICIOUS

PDF

52.6 KB Created: 2020-04-07 23:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5d6542f3d5553060639a57ccc94bf78f SHA-1: 7ed5f77850590b27f2648dc0b57a38378c76d658 SHA-256: 5bc75c353228054718f643342932f0159ef7826ea4ca0edd7f9710e62f217afb
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to "Passport photo maker 8.0 serial key" and references wkhtmltopdf, indicating a lure for software cracks or pirated software. The ML classifier strongly flagged this PDF as malicious, and the presence of many external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://theelfbox.com/uploads/1/3/0/3/130379204/130379204.html#passport+photo+maker+8.+0+serial+key
    • http://healthspanfoods.com/uploads/1/3/0/6/130604040/nekejesepededexij.pdf
    • http://geluksopleiding.nl/uploads/1/3/0/3/130323697/4d055beb6faac.pdf
    • http://nrg-electrical.com/uploads/1/3/1/1/131164473/8054484.pdf
    • http://chicagostringing.com/uploads/1/3/0/2/130272452/68b68cbfb43.pdf
    • http://teacherinfoseries.com/uploads/1/3/0/5/130541950/zafijiwurut.pdf
    • http://zagreb-experience-tours.com/uploads/1/3/1/1/131163833/570be98af9a5ffc.pdf
    • http://beccasbakery.net/uploads/1/3/0/4/130476120/rezaxovapijitaroxep.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076a5.bin
ef6162e282e3731dded9f9d0f5d6a431d4f1128222f168c4a0fe6b2c258c0775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 10032 bytes
font_01_sfnt_off00009a2d.bin
033d6403d2db8d489b40c4be57c4ae77790a0d20b8d9f68b28770cb018e32a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2D 6028 bytes
font_02_sfnt_off0000ada4.bin
9cedb1bb2a010e4dfb42ae4e4e6d753823ec2573e51af30d4ab542e9f741ae77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA4 16164 bytes

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