Malicious PDF — malware analysis report

Static analysis result for SHA-256 396897805eaedd96…

MALICIOUS

PDF

29.0 KB Created: 2020-05-17 01:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1715034bde82c9056c8962bff6972486 SHA-1: 9ac1f2b87a2f66fcdecb7cf3ae29d013066b4c4b SHA-256: 396897805eaedd960860c441557f42149e504052f826c728dc68cef0e54de5ad
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to other PDFs hosted on similar domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, so the exact payload delivery mechanism beyond the link farm is not discernible from this sample alone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://21fds.com/uploads/1/3/1/4/131454699/131454699.html#doraemon+game++n64
    • http://ashcraft.family/uploads/1/3/0/8/130813032/78185c.pdf
    • http://californiamarketingservices.com/uploads/1/3/0/7/130738680/9311139.pdf
    • http://poledancestars.net/uploads/1/3/0/5/130543293/700030.pdf
    • http://rsmfleet.org/uploads/1/3/0/7/130740221/ca6fb3c4.pdf
    • http://i-deep.com/uploads/1/3/0/8/130813648/24a629dcce8c.pdf
    • http://lwchouma.com/uploads/1/3/0/6/130620628/9730008.pdf
    • http://wmbcreditsolutions.com/uploads/1/3/0/2/130272937/fujirutijojob.pdf
    • http://dizacstickers.com/uploads/1/3/1/4/131482988/pokig.pdf
    • http://rutherfordlightingdesign.com/uploads/1/3/0/5/130551229/7986111.pdf
    • http://execadvantagevirtual.com/uploads/1/3/0/9/130969932/bemuvoxewatozibik.pdf
    • http://at9130.com/uploads/1/3/0/5/130590092/5346779.pdf
    • http://plumsolutions.org/uploads/1/3/0/4/130490314/pipozuvivedixuzo.pdf
    • http://rockthecatspa.shop/uploads/1/3/1/4/131483128/1006544.pdf
    • http://brownclawcreative.com/uploads/1/3/0/8/130813883/9ea3307ebf8c.pdf
    • http://beautysleepwithlamella.com/uploads/1/3/0/7/130775705/kibajuluboto.pdf
    • http://enrouteboutique.com/uploads/1/3/0/8/130814241/5828665.pdf
    • http://puntofrio724.com/uploads/1/3/0/7/130739756/d0852c00.pdf
    • http://outbackhoney.com/uploads/1/3/0/6/130621196/mojemejupedo.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_off00004985.bin
e6a3511fe661e897dfe7dd272784dbb7a8d97a286fd9b38307eb4ce1ef29666f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4985 9188 bytes

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