Malicious PDF — malware analysis report

Static analysis result for SHA-256 e323da5db34ab217…

MALICIOUS

PDF

31.1 KB Created: 2020-03-25 07:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1817fb93cda6d92bf6dd32b959239f66 SHA-1: 5cc5bd7c5d6422ed74ecff6600c21b30ee2a5791 SHA-256: e323da5db34ab2170d01b41696b21d230c9f359f4d30e6498e9191038a066c46
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of SEO-optimized PDF files, likely to manipulate search engine rankings or distribute malicious content indirectly. No scripts were extracted, limiting the analysis of direct payload delivery.

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://themaceyfit.com/uploads/1/3/0/5/130551366/130551366.html#subway+nutrition+facts+canada
    • http://www.dmitrenko.org/uploads/1/3/0/5/130538862/d65f8ade917cf.pdf
    • http://www.fennelonline.com/uploads/1/3/0/7/130776749/ruvibowuge.pdf
    • http://zanglesopmaat.com/uploads/1/3/0/5/130588727/5730521.pdf
    • http://scratchpaintpro.net/uploads/1/3/0/6/130621614/suvodofel.pdf
    • http://etchedinstone4u.com/uploads/1/3/0/3/130313320/605897.pdf
    • http://farmboyconsulting.com/uploads/1/3/0/6/130604552/e8ee83733e0374.pdf
    • http://mail.lechiro.info/uploads/1/3/0/8/130874001/jebizimiro.pdf
    • http://lorahakanson.com/uploads/1/3/0/5/130588430/5824427.pdf
    • http://nashveilevents.com/uploads/1/3/0/5/130539316/fajir.pdf
    • http://www.lisaellisfineart.com/uploads/1/3/0/9/130969477/puxetu.pdf
    • http://roselandshouse.care/uploads/1/3/0/9/130969980/fidefenudifi_javazagu_devirulixafat_madefo.pdf
    • http://akmalfood.com/uploads/1/3/0/4/130436426/6601963.pdf
    • http://bartdegreef.com/uploads/1/3/0/4/130479472/7296036.pdf
    • http://www.registration.sijcc.org/uploads/1/3/0/7/130739876/tovamimerixi-musujixepozige-goxatoj-pumufavuzeli.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_off000052e3.bin
909b04fc89352984b17c2c4128c8205e053f86be49a7d1b0e31961c3eaf1150b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E3 6816 bytes

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