Malicious PDF — malware analysis report

Static analysis result for SHA-256 1309f6f49f4c8a4a…

MALICIOUS

PDF

37.0 KB Created: 2020-06-18 11:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f527fa320be4fb6b614a7f7d17f2dd SHA-1: b1a8c83a45b9cb2839f2b33ef9bb49d754c0baf4 SHA-256: 1309f6f49f4c8a4a17f6deec349d212a86be0abfa1c5cd1e17f3d334b8abed2b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs is a strong indicator of a malicious intent, likely to redirect users to phishing or malware hosting 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://cretanmaliaredesign.devsite-1.com/uploads/1/3/0/5/130539287/130539287.html#fw40fb+motorguide+trolling+motor
    • http://bazalife.com/uploads/1/3/0/4/130476271/lumuwowumev-xegudowiwigokap-jagapad.pdf
    • http://uclrobotics.co.uk/uploads/1/3/0/6/130639803/botexarowazug.pdf
    • http://lisa-lindsey.com/uploads/1/3/0/4/130488574/7e1fb83754d5338.pdf
    • http://pagemusicale-lfs.com/uploads/1/3/0/4/130477074/ruxam-dajabageve.pdf
    • http://glazenwanden.net/uploads/1/3/0/5/130542965/3959524.pdf
    • http://deutsh.travelmittelamerika.com/uploads/1/3/0/6/130639869/9663244.pdf
    • http://ashlidwells.com/uploads/1/3/1/4/131437941/tamafawavaj-lobuzulisa.pdf
    • http://spotdrives.net/uploads/1/3/0/5/130539295/momebewabi-nimur-fugalox-wigofafanu.pdf
    • http://blingu.co/uploads/1/3/0/2/130272295/7732709.pdf
    • http://grandmabaa.com/uploads/1/3/0/4/130435947/6db44ddf7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054fd.bin
21fc7b3af96503bc0687ceb61d8a01f29c8a3d596f3793a45c0199fa1c0cce01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FD 5136 bytes
font_01_sfnt_off00006673.bin
98c7990141377d13ae899979df30da099a2b9b188b0ec5de8f1d42b0c989af3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6673 10164 bytes

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