Malicious PDF — malware analysis report

Static analysis result for SHA-256 0843970f240a6560…

MALICIOUS

PDF

48.8 KB Created: 2020-04-05 03:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fd297f7e3d92931dde902702b1841e7 SHA-1: 0aa26d58630be3c60f054416a98005275199c336 SHA-256: 0843970f240a6560d06beb1985508055bb4628d9b95931e0489576fc6ff31346
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the sheer volume of links points to a coordinated effort to drive traffic to external resources.

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://nationalfootballcheerleadersalumni.org/uploads/1/3/0/5/130541186/130541186.html#sustituyentes+quimica+org%C3%A1nica
    • http://des-publishing.com/uploads/1/3/1/3/131379236/disuxajamu-zokux.pdf
    • http://babymello.com/uploads/1/3/0/5/130543980/9612788.pdf
    • http://fibrolife.info/uploads/1/3/0/6/130621418/9b9d3d.pdf
    • http://wiggleandbark.com/uploads/1/3/0/7/130738893/nefivexupule-xalidez.pdf
    • http://lpco.xyz/uploads/1/3/0/2/130291441/2344836.pdf
    • http://prizinofzin.com/uploads/1/3/0/3/130323384/6260723.pdf
    • http://cafeessencebendigo.com/uploads/1/3/0/7/130776351/8314641.pdf
    • http://mitienditaluu.com/uploads/1/3/0/2/130271077/didetavojiwuk.pdf
    • http://oursecret.hu/uploads/1/3/0/5/130588304/8077386.pdf
    • http://iamjennifercannon.com/uploads/1/3/0/6/130621896/tekolebakapu-bibegipisogo.pdf
    • http://sfststephenschool.org/uploads/1/3/0/4/130435654/44bb769.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_off000092b3.bin
135e120d61e2818efcc34964305db294f81515ace2962e21a446c417e7f5e41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B3 9468 bytes

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