Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb89ac260ce83769…

MALICIOUS

PDF

28.0 KB Created: 2020-04-18 17:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3466316a1904d1827358252659afffb1 SHA-1: 6b538c2f4444f2e3173400717012da5363d2f728 SHA-256: bb89ac260ce8376921ac1eb733e9e426bb5c4bffdb6fd3087638a1fcaa90110d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to direct users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ecofuture.info/uploads/1/3/1/3/131380500/131380500.html#sscanf+format+string+size
    • http://muttsociety.com/uploads/1/3/1/4/131438692/nitaxumipa_jevarof_danekole_sosajatom.pdf
    • http://larphub.org/uploads/1/3/0/2/130273907/a05dd62.pdf
    • http://riseperformance618.com/uploads/1/3/0/7/130776201/7f230.pdf
    • http://explorerchickadventureco.com/uploads/1/3/1/4/131453823/56ab44d427b66b.pdf
    • http://aricaalp.com/uploads/1/3/1/3/131397997/a83d79e.pdf
    • http://cyonsolutions.com/uploads/1/3/1/6/131636602/6a80552a.pdf
    • http://tradedevelopmentservices.com/uploads/1/3/0/9/130969755/f8be6dad8b5dc.pdf
    • http://carbonneutralnetworks.org/uploads/1/3/1/4/131453495/sefeg.pdf
    • http://emberunderground.com/uploads/1/3/1/3/131384418/2549316.pdf
    • http://pauloneves.org/uploads/1/3/0/7/130774999/7878420.pdf
    • http://petropoint.net/uploads/1/3/0/3/130313702/0ada2e4a088.pdf
    • http://alllivesmatter-ohio.org/uploads/1/3/0/2/130272319/695f890e9e.pdf
    • http://anguillavillavacation.com/uploads/1/3/0/4/130436014/6219539.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_off00004d47.bin
57e4fa40999287dc08d6eb2cc600775db3178c3294124fe9038f70fd6a544d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D47 5640 bytes

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