Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3b6f862f0a5194…

MALICIOUS

PDF

61.3 KB Created: 2020-05-26 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c722e164a0ca4f3b97ccee2dcd04c8bf SHA-1: 466c8506a8e686f00d5b733c6f2d54eeabe29225 SHA-256: 7c3b6f862f0a5194eb57435a500b3e39e10b5d52cf60807601b45030fd0a7a9d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs suggests a distribution or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to drive traffic to malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://smokeboxheroes.com/uploads/1/3/1/8/131871863/131871863.html#essentials+of+entrepreneurship+and+s
    • http://delindalmccann.com/uploads/1/3/1/3/131383591/ca017.pdf
    • http://bvoll.com/uploads/1/3/0/6/130639491/maxagakomatuj_jagafew_rudimuzejazedav.pdf
    • http://mta-sts.mx.juliesenf.com/uploads/1/3/0/2/130287971/gamodekomukew.pdf
    • http://pro-balanceusa.com/uploads/1/3/0/8/130874097/3337555.pdf
    • http://skopjewinesalon.com/uploads/1/3/0/2/130291838/41df2ed55972a.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58f.bin
38ee8dcd55ad09a3a9b27566558104af385e150dc0602e545ac1bed440c56a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 10704 bytes

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