Malicious PDF — malware analysis report

Static analysis result for SHA-256 8984388ce54a6a6e…

MALICIOUS

PDF

49.3 KB Created: 2020-04-05 03:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9fe700b3acc3bbbbe8385e6385e47db2 SHA-1: 4c1f495052b35116c459b1f80952995ef594353b SHA-256: 8984388ce54a6a6e0e24159fd631f248ab16565e918146dc2d24cd701d45da04
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be directing users to a network of linked documents, potentially for phishing or to host further malicious payloads.

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://zombiexone.com/uploads/1/3/0/6/130621285/130621285.html#filosofia+racionalismo+empirismo+apriorismo+asociacionismo+y+positivismo
    • http://patriotcurrencyexchange.com/uploads/1/3/0/5/130588931/futegolatenagixonam.pdf
    • http://monumentexpressions.net/uploads/1/3/0/5/130588987/gesidumudapurip_roxiwisuzofunuf_liwer.pdf
    • http://elitetalentgroup.org/uploads/1/3/0/5/130547078/7007482.pdf
    • http://peequality.com/uploads/1/3/0/5/130546923/filobutuxop_sibepalum.pdf
    • http://betterthanb4furniture.com/uploads/1/3/0/4/130490776/bidevowilulex.pdf
    • http://bralesspodcast.com/uploads/1/3/0/6/130620997/37a35f9bae2d0f8.pdf
    • http://mgugeldesign.com/uploads/1/3/0/2/130289380/96044.pdf
    • http://ljtelectricalcontracting.com/uploads/1/3/0/6/130621867/tajegutifipinux.pdf
    • http://kleinskillfruitfarm.com/uploads/1/3/0/8/130874600/mugivedokaxipi.pdf
    • http://bellinghamgreekfestival.org/uploads/1/3/0/6/130622053/xuwawifat.pdf
    • http://mercerwoodproductionsllc.com/uploads/1/3/0/4/130476145/kudozinavebekepe.pdf
    • http://professionalresultsorganizing.com/uploads/1/3/0/4/130491699/piter.pdf
    • http://themaindishcatering.com/uploads/1/3/1/3/131384489/jadaluj.pdf
    • http://gracewalkfarm.com/uploads/1/3/0/2/130271023/9caf9f1c93.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082a9.bin
70ba50baf1730956aec690f562c7978a3772a270c341c994b4a8614161c378af
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A9 7368 bytes
font_01_sfnt_off00009f9b.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9B 16204 bytes