Malicious PDF — malware analysis report

Static analysis result for SHA-256 299af7061ce99da0…

MALICIOUS

PDF

42.1 KB Created: 2020-03-20 06:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea40206c8461c04c6955ebc12a0206c9 SHA-1: a9b3059a0f26839b2a5db5f32c9f13d8ae245f89 SHA-256: 299af7061ce99da0cde1419b0f8e66ea50821b86d065434b6fa29545d8aaef89
96 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with 30 links pointing to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness. The embedded URLs suggest a link-farming or SEO poisoning attack, aiming to drive traffic to potentially malicious content or exploit search engine vulnerabilities. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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://chewoncakes.com/uploads/1/3/0/3/130313316/130313316.html#como+exportar+de+autocad+a+archicad+21
    • http://cabinetnelson.fr/uploads/1/3/0/6/130621321/ligimirikale.pdf
    • http://laxconstruction.net/uploads/1/3/0/8/130813399/karidokilevigenino.pdf
    • http://chrismurraywheelworks.com/uploads/1/3/0/5/130540293/6319049.pdf
    • http://thissideofhope.com/uploads/1/3/0/9/130969259/d47851c6f29ef.pdf
    • http://navamtech.com/uploads/1/3/0/2/130291971/71a54e4ab56f6d9.pdf
    • http://remote.capitolcom.com/uploads/1/3/0/6/130639155/ca08126355.pdf
    • http://www.tjconsultations.com/uploads/1/3/0/2/130274355/d0058bf3bf105f.pdf
    • http://www.therapyandsoul.com/uploads/1/3/0/7/130738705/8069896.pdf
    • http://annajaneuzzell.com/uploads/1/3/0/3/130323335/famusuvegapuxa.pdf
    • http://vetpoint.us/uploads/1/3/0/2/130289735/kodifupu_xanixe.pdf
    • http://joshwae.shop/uploads/1/3/0/5/130588747/nujavuza_zelev_zonugivelit_simim.pdf
    • http://www.themommymedicineshow.com/uploads/1/3/0/3/130323424/napisupazebokaz-tukeb.pdf
    • http://myeneeproject.com/uploads/1/3/0/6/130604821/lazamarep.pdf
    • http://libdot.org/uploads/1/3/0/3/130323412/jejunapifix_geruvavunamokot_rokepexug.pdf
    • http://www.laurengarciaphotography.com/uploads/1/3/0/6/130604193/5877424.pdf
    • http://sveos.net/uploads/1/3/0/7/130740060/xumap-fewuvipozefas-puged-jemozepevamebu.pdf
    • http://www.embracethewaiting.com/uploads/1/3/0/6/130621026/6dfc85496aa846b.pdf
    • http://zollthai.com/uploads/1/3/0/7/130776101/96659977.pdf
    • http://donnaleephotography.com/uploads/1/3/0/5/130547024/wasejanetu.pdf
    • http://www.clinicadelsorrisosrl.it/uploads/1/3/0/5/130550891/lexavoxunubi_xexapifiza.pdf
    • http://bbinspired.org/uploads/1/3/0/5/130539046/8778806.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_off00007780.bin
b683459e4a5f144e945c5d71000dc6614c485a7cf3113876051021c296858e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 9604 bytes

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