Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b881a2cd60db11…

MALICIOUS

PDF

43.3 KB Created: 2020-04-03 12:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3c86370581913907375a74c246a0821 SHA-1: 4215cc8e9a2fb74cbb6bd17ed450b02866aecabd SHA-256: 85b881a2cd60db11b68c23604fa55e9fed59ace99651cc333a7e5154c26f01d4
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of external links, suggesting a coordinated effort to direct users to potentially harmful content. The primary attack pattern involves luring users through these numerous links.

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://capitolaishome.com/uploads/1/3/1/3/131382536/131382536.html#ventaja+comparativa+de+mexico+con+brasil
    • http://twbmotors.com/uploads/1/3/0/5/130539102/846252a897f3.pdf
    • http://spearheadlog.com/uploads/1/3/1/4/131482859/f53120a1.pdf
    • http://jewelrysoycandles.com/uploads/1/3/0/7/130776213/eb685a6.pdf
    • http://philippemartin.xyz/uploads/1/3/0/5/130588428/29cdc.pdf
    • http://bskwebdesign.com/uploads/1/3/0/8/130814225/pofimawawenug_vewofabop_fudoriwab_muwepukigunobuk.pdf
    • http://sonomacountytherapist.com/uploads/1/3/0/5/130547771/kojife-riwiwas.pdf
    • http://ricecakes2011.com/uploads/1/3/0/8/130813714/juriwejada-kerewewis.pdf
    • http://angelscenographer.com/uploads/1/3/0/8/130814280/baed98.pdf
    • http://icarllc.net/uploads/1/3/0/6/130604641/2681e3aab.pdf
    • http://www.fitformmeals.com/uploads/1/3/0/6/130621120/wumizoniwej_bipopadag_kagedevefarol.pdf
    • http://mylindahullmusicaltheatre.com/uploads/1/3/0/7/130775025/6740516.pdf
    • http://windycitybroken.com/uploads/1/3/0/2/130288316/jiwuvokivedaluviwuto.pdf
    • http://ecclescenter.org/uploads/1/3/0/6/130621905/dijoxukivifitavifer.pdf
    • http://nifftymobilesolutions.com/uploads/1/3/0/6/130639508/35773.pdf
    • http://forreelzmedia.com/uploads/1/3/0/2/130289784/4444af39db83b9e.pdf
    • http://nkbnobles.com/uploads/1/3/0/8/130814596/4436456.pdf
    • http://vrnmanagement.com/uploads/1/3/1/4/131437812/jowuvaxilusu.pdf
    • http://bitmoneymasters.com/uploads/1/3/1/4/131453573/9c3fe168ec34.pdf
    • http://613sold.com/uploads/1/3/0/4/130488365/xusesamutilal-winikobebusev.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_off00007f27.bin
c8cbcdcf0a22cb4c8417cf9a52bf0c0297788ac61c9fe4fc8522dda465e6c796
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F27 8368 bytes