Malicious PDF — malware analysis report

Static analysis result for SHA-256 69739e66b50b73a6…

MALICIOUS

PDF

43.8 KB Created: 2020-04-11 10:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c71eec7e207f111c91c1a9cdcc760e9 SHA-1: dd8343d46b368f04e6caeab4344cc5c5f4909140 SHA-256: 69739e66b50b73a611fdf9d39e2be377568b15f41564323ace8b8d2f0aa4c95e
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 point to other PDF files, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external URLs suggest the document is designed to redirect users to potentially malicious content or phishing 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://ndchair.com/uploads/1/3/1/4/131454093/131454093.html#camera+fujifilm+s8200+manual
    • http://hairts.com/uploads/1/3/0/7/130738823/bda5cce19.pdf
    • http://christyeverett.com/uploads/1/3/1/4/131437931/sifuvirofi-bejivuvam-jadusa-bopuminow.pdf
    • http://blessthishotmess.net/uploads/1/3/0/4/130435679/c2f2274b9fb.pdf
    • http://roadlesstraveledoutfitters.net/uploads/1/3/0/7/130775641/1038566.pdf
    • http://kmgchina.com/uploads/1/3/0/7/130739239/2eb20a.pdf
    • http://jlbservicesolutions.com/uploads/1/3/0/2/130289247/fefidefesiwipikuza.pdf
    • http://bournemouthmindfulness.net/uploads/1/3/0/4/130479008/mosamiga.pdf
    • http://thenaturalsnyc.com/uploads/1/3/0/2/130272481/690f0500eefe.pdf
    • http://viajesmaple.com/uploads/1/3/1/4/131454155/lepevudok.pdf
    • http://losbuchones.com/uploads/1/3/0/8/130814279/6e075455.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_off0000760d.bin
fbe5e7ceb024fcacb8b4798ee960bf11feb62500422c57fb54d6a87da3d6204d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 9516 bytes
font_01_sfnt_off00009992.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9992 2616 bytes

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