Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f46a06a01e1066…

MALICIOUS

PDF

25.9 KB Created: 2020-05-14 21:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e170b968f264d87003688a951b32b03 SHA-1: 4ac7c8229140ece9308e09910ddf7aff65f0c4b3 SHA-256: 33f46a06a01e1066e749de7227ed8aeba9db0c7456241107d37fae8e4eb95d1a
116 Risk Score

Malware Insights

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

The PDF is identified as an image-only document designed as a lure, typical of phishing attacks. It contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or a method to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 25 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://atelierjademyr.ca/uploads/1/3/0/6/130604324/130604324.html#fitbit+charge+3+manual+guide
    • http://sgreptilesandaquatics.com/uploads/1/3/1/4/131409508/4834727.pdf
    • http://setamortgage.com/uploads/1/3/0/5/130539255/1839eafba237.pdf
    • http://eilermannhomevideos.com/uploads/1/3/1/4/131438038/5902772.pdf
    • http://highmarginsinc.com/uploads/1/3/0/5/130590367/6a9e2e62b82fc.pdf
    • http://illuminationofself.com/uploads/1/3/1/4/131406046/jovurugetew.pdf
    • http://rockphilosopher.com/uploads/1/3/0/5/130550663/030e98770.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043b2.bin
5b246182863a3b803da3dacabd4df21f163da95259b71437389c0d11869211a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43B2 7428 bytes

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