Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c482991020f491…

MALICIOUS

PDF

43.0 KB Created: 2020-06-08 11:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1f1bf87b399e5d9161755dca9043e0 SHA-1: 6eb002a0036d9288b8cbcb5851d23b6ad8700b0a SHA-256: 84c482991020f491b0c6dac2b6224b20f6f6c426196708f354a30a79ea243bea
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to external PDF files, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body also contains a URL that points to an HTML file, which in turn likely links to more PDFs. This suggests a tactic to manipulate search engine results or to distribute further malicious content. No scripts were extracted from this sample.

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://freshjoes.net/uploads/1/3/1/3/131383652/131383652.html#search+inside+yourself+pdf+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587
    • http://icgglobal.org/uploads/1/3/1/3/131380966/kapuwagajivula.pdf
    • http://jesuslovesyougiftshop.com/uploads/1/3/0/2/130272903/819fe15.pdf
    • http://michelletrappen.com/uploads/1/3/0/5/130551464/1291909.pdf
    • http://thetaylorcheek.com/uploads/1/3/0/2/130272403/xurokakotep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wutiwewero.files.wordpress.com/2020/06/miramuduvinozukix.pdf
    • https://tofosigon.files.wordpress.com/2020/06/gakonenex.pdf
    • https://wupogoxaxiwu.files.wordpress.com/2020/06/majukonegaxerile.pdf
    • https://resudixam.files.wordpress.com/2020/06/344109831.pdf
    • https://tuvelajago.files.wordpress.com/2020/06/wagogupubozikazorala.pdf
    • https://jinotazataga.files.wordpress.com/2020/06/38094903991.pdf
    • https://xididegafe.files.wordpress.com/2020/06/pujawajudafe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d36.bin
de27ec63c3c86dd65985811ff00bda9edcce6d32e341956c5ac6497058414f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D36 22496 bytes

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