Malicious PDF — malware analysis report

Static analysis result for SHA-256 20493bf9392a4045…

MALICIOUS

PDF

35.2 KB Created: 2020-04-15 11:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfc0989363291b695e951033cd940f93 SHA-1: a4e9e528351e546d9c1ea21bc2c66cff76bc217f SHA-256: 20493bf9392a4045f65a4923d48138dd183136d9ad0d388a18ed3a9e2cd71e7c
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness. The presence of a large number of external links suggests an attempt to manipulate search engine results or distribute further malicious content, aligning with common SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kitchenremodelokc.com/uploads/1/3/0/6/130604447/130604447.html#bacterias+que+conforman+la+flora+intestinal
    • http://chelseahartling.com/uploads/1/3/1/3/131379015/zufemugaxitokuziv.pdf
    • http://planpressed.com/uploads/1/3/0/5/130589100/92e88193.pdf
    • http://dare2imagineit.org/uploads/1/3/1/3/131398400/d1d61f0cd5.pdf
    • http://employerservicesgrouphr.net/uploads/1/3/0/6/130604621/6106991.pdf
    • http://thecuratorconsultancy.com/uploads/1/3/0/6/130604088/188752.pdf
    • http://eco-muse.org/uploads/1/3/1/1/131163760/8c31ef.pdf
    • http://chevysalesgirl.com/uploads/1/3/1/6/131636980/7011617.pdf
    • http://chevysalesgirl.com/uploads/1/3/1/6/1316369
    • 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_off000060ff.bin
08b9db89a9d752174d4a92178e52b3466805637f74630573a5a786cb0f350dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 8272 bytes

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