Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f69d1986ff04f50…

MALICIOUS

PDF

40.4 KB Created: 2020-04-21 16:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 09866e8f4018715b292ec71f1b943eb0 SHA-1: 2244150e037a0e44e81521d8e89198078bab50c1 SHA-256: 0f69d1986ff04f509d216b0724578290eca4d7d0800c7639446ea5dd05bf07b8
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting a social engineering lure. The presence of multiple external PDF links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://becdaxis.com/uploads/1/3/0/5/130590208/130590208.html#english+spelling+bee+answers
    • http://gestaltoftherockies.org/uploads/1/3/0/7/130740097/dabemonodolomotoben.pdf
    • http://thepipelinefitness.com/uploads/1/3/0/7/130775357/nasexesewu.pdf
    • http://couragetojump.com/uploads/1/3/0/5/130545189/2598208.pdf
    • http://toddlertownashland.com/uploads/1/3/0/4/130476266/15b439db3f044.pdf
    • http://alston.de/uploads/1/3/0/8/130814676/6208726.pdf
    • http://johnwesleyhardin.it/uploads/1/3/0/6/130621407/7074669.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006403.bin
7eb76a132d79d28fd4a51043f8b28cea9cb1c7c6befa7cee4b9d7582922f7c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 8092 bytes
font_01_sfnt_off00008343.bin
e8c4a83ea2c67cfd6ecaf3b62f88bcc7f425a203c0b66b5e8d5598de17e1d012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8343 5748 bytes

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