Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b1862e469f5670…

MALICIOUS

PDF

38.9 KB Created: 2020-04-07 16:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ff8503c0b43581f793355c26970d6cf1 SHA-1: bae9b4727f96f650f6af4b058976f8ecd99a920d SHA-256: 04b1862e469f5670bdcc0de36be7aa499735364d7d75b88abda08185e95d073d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of an SEO link farm. The document body, though heavily obfuscated, contains URLs that are repeated in the extracted IOCs. This suggests the primary purpose is to drive traffic to these external sites, which could host further malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

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://morningsidehills.com/uploads/1/3/0/4/130477805/130477805.html#wakefield+school+the+plains+reviews
    • http://padgettpromotionsllc.com/uploads/1/3/1/3/131384015/4364520.pdf
    • http://uintasecurity.com/uploads/1/3/0/7/130739772/zijulijiruramopi.pdf
    • http://steelcitytavern.com/uploads/1/3/0/5/130546096/jetibope_xurewezej_leritegeporaj_ligowe.pdf
    • http://duvalcareers.com/uploads/1/3/0/9/130969200/nuxurixusepinubuw.pdf
    • http://collegeprep101.org/uploads/1/3/0/5/130540146/6698333.pdf
    • http://snipesconglomerate.com/uploads/1/3/0/3/130313358/jufosifupefumag.pdf
    • http://featherfallsmobileestates.com/uploads/1/3/0/7/130740325/8443d8b4a76b09f.pdf
    • http://isladelplacer.com/uploads/1/3/1/3/131380612/96527f.pdf
    • http://propropertymanagementllc.net/uploads/1/3/1/4/131408371/79bd168e97d.pdf
    • http://campdavidtx.org/uploads/1/3/0/5/130589239/gemaxanij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000778b.bin
0446a4a7bf24f2d14445673fe700efbbc887fc15346e8e158d49f76de6081be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 7752 bytes

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