Malicious PDF — malware analysis report

Static analysis result for SHA-256 6becd5c6329047f9…

MALICIOUS

PDF

42.9 KB Created: 2020-04-07 07:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 618b909380774fe4b76e8a49cc834ad1 SHA-1: 42aacf9d02327344eb6ab2cf23a2b6b9343f807d SHA-256: 6becd5c6329047f9101604056ea6e5e8a45e118e3ead91dbffc0880635ac49fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests a phishing or content-distribution attack pattern, likely initiated via a spearphishing attachment.

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://kmipropertieslimited.com/uploads/1/3/1/3/131398295/131398295.html#fuente+de+alimentacion+lineal+variable
    • http://jaaphotographer.com/uploads/1/3/0/6/130621853/fizitozejene.pdf
    • http://worknparty.com/uploads/1/3/0/4/130491699/vonifugodoripi.pdf
    • http://woundedbutnotbroken.net/uploads/1/3/0/9/130969983/zufalusuguza_kagobagiboze_medolivivonefo.pdf
    • http://saeart.com/uploads/1/3/0/7/130775388/4fa2d34.pdf
    • http://beesbizz.com/uploads/1/3/0/7/130738725/2416940.pdf
    • http://animasbodywork.com/uploads/1/3/1/3/131378916/wivet_widuwi.pdf
    • http://genrhs.org/uploads/1/3/0/5/130590457/7b49a8d2295.pdf
    • http://ouwaraniecolodge.com/uploads/1/3/0/9/130969488/2fe20f280f2.pdf
    • http://tshirtmerchpa.com/uploads/1/3/0/6/130604689/6925994.pdf
    • http://mypremiermobilenotary.com/uploads/1/3/0/7/130775748/jafefigezuzab.pdf
    • http://emeraldlakeapartments.net/uploads/1/3/0/7/130776307/4144202.pdf
    • http://standoutindallas.com/uploads/1/3/0/6/130603764/3144262.pdf
    • http://beroean.org/uploads/1/3/0/6/130604823/5948137.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000712d.bin
7de0ce51122ba89c402a6ccea294f7414d47b7f418d5926782f21af86ce62281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712D 9060 bytes
font_01_sfnt_off00009229.bin
d8435aac11388b8214bfc980e857510ef47481ba706565f25bd6cae8efb01319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9229 2828 bytes

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