Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e9be8d84415b62…

MALICIOUS

PDF

68.7 KB Created: 2020-03-12 11:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 72f76e117b20f589ce9ab9f0b60b5d0d SHA-1: f46137910ddd46a22eb403564e3b5cf2bdfc705d SHA-256: 66e9be8d84415b62de8ca242e5c2a3252fb1ccdea5f5a30298dfc4961de6908a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious content or phishing sites.

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://3dklx.bpmtc.com/uploads/1/3/0/3/130323182/130323182.html#alfabeto+cirilico+russo+tradutor
    • http://plantforagreenearth.org/uploads/1/3/0/5/130552106/7395671.pdf
    • http://seattlecitylight.org/uploads/1/3/0/7/130738504/xakuzofamozopevupamo.pdf
    • http://homebasedworkforyou.com/uploads/1/3/0/5/130589108/be2786cdcbd.pdf
    • http://northolmesjuniorschool.com/uploads/1/3/0/6/130604771/cc350a4862a62.pdf
    • http://crestonewealthconsulting.com/uploads/1/3/0/7/130776847/xafiwofajinupa.pdf
    • http://www.cristinasbridalma.com/uploads/1/3/0/8/130814254/6703341.pdf
    • http://lotusessentials11.com/uploads/1/3/0/8/130873738/volumuxusi-dabuz.pdf
    • http://walksforwoofs.com/uploads/1/3/0/3/130323761/3530133.pdf
    • http://www.panamaford.com/uploads/1/3/0/2/130272295/vubafotu.pdf
    • http://mail.kamtectools.com/uploads/1/3/0/2/130291996/9316871.pdf
    • http://beckiegkengle.com/uploads/1/3/0/4/130488398/sixewozenolufa.pdf
    • http://mywebsiteinabox.com/uploads/1/3/0/6/130604859/tiwoxapalox-jusana-simefojat-mujonud.pdf
    • http://bayareainternretreat.com/uploads/1/3/0/3/130379696/8907993.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e85.bin
2fdbb023ddf1e19b449065c536f767668c2e5fcca28a335a0c32c790719c6ef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E85 24032 bytes
font_01_sfnt_off0000cf8d.bin
185a46137ef41644a79fc70c5d08998d36cbfbfaf03a84614c5dd9a2a07480ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 5616 bytes
font_02_sfnt_off0000e14f.bin
0f607259502208bb9a1b7384aa49418cd00d0cd5424a861835d70366e6410372
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 19916 bytes