Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9afb62b570f829…

MALICIOUS

PDF

38.0 KB Created: 2020-04-11 07:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de02a42a77e3dc475564e26f18a294e5 SHA-1: 96a8994ae291987b6ae70e7a65a9ba35bdc69ef0 SHA-256: 5c9afb62b570f8291f398b839860cccf2bf8bd3a3b8839dc711433b34ea6a8bd
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 other PDF files hosted on various domains, indicating a link farm or phishing campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the document's structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wcd-qnv77h4.mgh-r.ch/uploads/1/3/0/6/130604069/130604069.html#eso+physical+resistance
    • http://jbrosenterprises.com/uploads/1/3/0/7/130776291/mapirojaz.pdf
    • http://acupuncture4pets.ca/uploads/1/3/0/9/130969331/3249276.pdf
    • http://rockitanywhere.com/uploads/1/3/1/3/131379596/kiwopukide-sutugojuvuwigad-vaxabono-jufaxisatobuf.pdf
    • http://ancientrootsdesigns.com/uploads/1/3/0/3/130313098/pidumekugoluxo_bemil_morof_ziduvikafeti.pdf
    • http://julyisfreedom.com/uploads/1/3/0/7/130740438/pomusanotabivanesoxe.pdf
    • http://wise-worth.com/uploads/1/3/0/3/130313002/6245714.pdf
    • http://smokingdollhead.com/uploads/1/3/0/5/130590142/sopusakeb-vusedar-tudigusoved-suzuweguzux.pdf
    • http://advancemanage.com/uploads/1/3/0/8/130873852/tesit.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_off00006eb4.bin
929e49ce3183e5e4f8411d520faf6ecf8dc01d3c2ff52eb182a27fa5c8eb0b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 7704 bytes

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