Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b4a7cfc1d28b42…

MALICIOUS

PDF

31.5 KB Created: 2020-05-15 05:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e256f009d169e073a95de62b23bef4 SHA-1: 454b69ebbede3268400ea81b2e44408d3973e60e SHA-256: 00b4a7cfc1d28b42a47b18777702ea1eb5e0fcaf14a5cf1293bf40282e8dfa77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains URLs that are likely used to redirect the user to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://missjordansclassroom.com/uploads/1/3/1/0/131069859/131069859.html#eating+disorder+treatment+plan+template
    • http://mrsshamrock.com/uploads/1/3/0/5/130590219/derafes.pdf
    • http://dkfuneralphotography.com/uploads/1/3/1/0/131070820/97615daa.pdf
    • http://northwesthorseboxhire.com/uploads/1/3/1/1/131163635/728390.pdf
    • http://cbdproductsusa.org/uploads/1/3/0/7/130776132/lajobu.pdf
    • http://cafe109-fullerton.com/uploads/1/3/0/7/130739247/sozozariwowoluleku.pdf
    • http://dragonflygifts.org/uploads/1/3/1/6/131636719/sixonerosogalum-sirate.pdf
    • http://jaewonshin.com/uploads/1/3/1/0/131071308/mewifika.pdf
    • http://lakesidegutters.com/uploads/1/3/1/4/131437976/sokaz_mabodavuve_waseses_terobavuputad.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_off000051ba.bin
6c73f23999f2dc036ee8b31f34c5c32db969247b061c3a8b01a2a57d05d9adab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BA 9816 bytes

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