Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3324a650ede27d3…

MALICIOUS

PDF

38.3 KB Created: 2020-04-09 12:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee2ddbc9c83802f9696fa7f35aaede72 SHA-1: 55d0a9a6ed2f19cc2d466523e00746bff5c93d21 SHA-256: b3324a650ede27d33cd56a1007ec2e73be11f75b3569a56e84e5872e859c0a8c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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://myarconsulting.com/uploads/1/3/0/3/130313507/130313507.html#escala+1%2F24+medidas
    • http://portlandareainjury.com/uploads/1/3/0/7/130740123/nijofiriz.pdf
    • http://monarchapothecaryandtrading.com/uploads/1/3/0/6/130621506/kagijatedadetewof.pdf
    • http://lewisvillepestpros.com/uploads/1/3/0/6/130621780/jimujelobawevitajixo.pdf
    • http://starinsgroup.com/uploads/1/3/1/1/131163832/4f9de3a.pdf
    • http://saltandlightessentials.com/uploads/1/3/0/7/130739399/42940222743e97e.pdf
    • http://youniquedancewear.com/uploads/1/3/1/4/131453355/5097553.pdf
    • http://cpanel.tacosmexican.com/uploads/1/3/0/6/130639074/9346277.pdf
    • http://counselingcollaborativesllc.com/uploads/1/3/0/6/130620367/jawinigewakejujojiz.pdf
    • http://deckyourdesktop.com/uploads/1/3/0/7/130775002/92a6e0cf5c7f339.pdf
    • http://touchscreentravel.com/uploads/1/3/1/1/131164110/lelomimemanip_gipipikaxag_notufikikamef.pdf
    • http://dawserco.com/uploads/1/3/0/6/130639913/degifug.pdf
    • http://servicedogsforvets.com/uploads/1/3/0/6/130604523/pudowumekikiki_lebafemo_dovowuwizule_xugevope.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_off000069bf.bin
b4eb0c447c0f61d61de1d2e212c8f39cfa8e3c0d06311bcb4428b1a71e7248bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 9572 bytes

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