Malicious PDF — malware analysis report

Static analysis result for SHA-256 8662b4a9e7b0420b…

MALICIOUS

PDF

50.5 KB Created: 2020-04-11 04:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1155a2d827188c35172f823e84f713b8 SHA-1: 3ee56596b136f8d08f876ce27da3f166dcfd4736 SHA-256: 8662b4a9e7b0420be615ab9633ff686e87eb8c7b471bae90f9878107391a52d0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm for SEO manipulation. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cyclebavaria.com/uploads/1/3/1/4/131406154/131406154.html#kawasaki+fd620+engine+service+manual
    • http://winmillppm.net/uploads/1/3/0/4/130435514/fizeluvad-jinolobexof.pdf
    • http://nosetotailclub.com/uploads/1/3/0/2/130271047/da0789ca705.pdf
    • http://focusedfit.org/uploads/1/3/1/3/131380969/fe18558045915e7.pdf
    • http://hj888enterprisepteltd.net/uploads/1/3/0/2/130289242/4767605.pdf
    • http://willowswonder.com/uploads/1/3/1/3/131398232/93882.pdf
    • http://brightlightsvideo.com/uploads/1/3/0/2/130270985/0ee5cca3422.pdf
    • http://boutiqueforboth.net/uploads/1/3/0/7/130738559/zuwulubugazo.pdf
    • http://stephaniesstoragesale.com/uploads/1/3/0/4/130488469/4660821.pdf
    • http://livlocalart.com/uploads/1/3/0/3/130323092/bumuxeto.pdf
    • http://sosilassl.com/uploads/1/3/0/7/130776779/e9147877bfca82.pdf
    • http://alsantuarioaffittacamere.com/uploads/1/3/0/6/130621378/a64c33eb9ce52b.pdf
    • http://recuerdosenfoto.com/uploads/1/3/0/7/130739483/dokavupavomurogikefe.pdf
    • http://assessment.law/uploads/1/3/0/3/130323453/baxasifelamenen.pdf
    • http://marsteschool.com/uploads/1/3/0/6/130621388/4596793.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_off00009c8c.bin
48ee56fa95aad66fb31e8e01eeba2f6458ea968f2044275af12c09a8a9e44060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8C 8640 bytes

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