Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef8b3fad2c61aef…

MALICIOUS

PDF

35.9 KB Created: 2020-04-01 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de8a69fc4b98abd8866d4fca026d566f SHA-1: cae04395bdf6717bc1ad33fd28a68a9294faef4f SHA-256: 6ef8b3fad2c61aefac1efae74b87400ac694eadaf2887d66161f7bc4ad238ca4
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm. No scripts were extracted, but the document body and embedded URLs suggest a lure to external content.

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://tmttriotruckingllc.com/uploads/1/3/0/9/130969310/130969310.html#e%C4%9Fitim+psikolojisi+kpss+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+2017
    • http://hofbuchhandlung-loewenberg.de/uploads/1/3/0/5/130590287/ginel.pdf
    • http://social-reign.com/uploads/1/3/0/6/130621176/5457675.pdf
    • http://artani360.com/uploads/1/3/0/6/130605443/8428669.pdf
    • http://unitylifestyleznovelty.com/uploads/1/3/0/5/130589286/9642830.pdf
    • http://lifeforceeco.com/uploads/1/3/0/9/130969411/4810f92179a7.pdf
    • http://wlptax.com/uploads/1/3/0/2/130287537/zilugozopubujix.pdf
    • http://www.learnjapanesebooks.sewbookish.com/uploads/1/3/0/6/130621217/8730199.pdf
    • http://beerbolds.com/uploads/1/3/0/8/130874224/fadewuvitimafiwaxari.pdf
    • http://gooddogtheatre.com/uploads/1/3/0/6/130620272/04149ab70e84.pdf
    • http://treesrollingpapers.com/uploads/1/3/0/7/130775309/b1ee0.pdf
    • http://alextindall.net/uploads/1/3/1/3/131382223/vofesowajudor-digatuw-neworu-kuvobufavoge.pdf
    • http://davewatersvo.com/uploads/1/3/0/7/130776088/03d3851558a3a.pdf
    • http://quitecoolinstall.com/uploads/1/3/0/6/130604473/64138b0c.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_off00005bc2.bin
1b6856d48a7c6b1c027bca1bd22efe46d70fc13638527fe028901d8238ace66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC2 10620 bytes

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