Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3194c6efb36a322…

MALICIOUS

PDF

40.7 KB Created: 2020-04-13 22:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 336714b92302502717bec31c20c9e6f4 SHA-1: bfb582f880fdb00e3d24bc6f9362b0192936ad11 SHA-256: b3194c6efb36a322d260a35b136872ece95e80b9da06cf93e9185632f7907c26
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, many of which are dynamically generated and point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to industrial equipment and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mikkinicolecollextion.com/uploads/1/3/0/8/130813747/130813747.html#metso+jaw+crusher+c106+pdf
    • http://thefarmwifeparadox.com/uploads/1/3/0/9/130968934/fodorufevoka.pdf
    • http://jessicakinnison.com/uploads/1/3/0/4/130475966/3437076.pdf
    • http://pranayogawellness.net/uploads/1/3/0/4/130479123/velevogixomed_kufabile.pdf
    • http://wwfireandsafety.com/uploads/1/3/0/2/130289205/zudajojutiketub.pdf
    • http://thesoftersideofdance.com/uploads/1/3/1/3/131383648/dubuzatemixijorujaju.pdf
    • http://brushhill-rvstorage.com/uploads/1/3/1/4/131452838/ginuxixifegibisiri.pdf
    • http://loueyvee.com/uploads/1/3/0/5/130544321/mudowakesalivebefo.pdf
    • http://ashleygrandkoskiacupuncture.com/uploads/1/3/1/0/131070313/2030566.pdf
    • http://giveittogod.net/uploads/1/3/0/7/130775320/tomazidi.pdf
    • http://giveittogod.n
    • 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_off00007713.bin
4e153d6bd1b4822d1b208f891a4ead1a5f75e1f87fda2de8ab3ed26dd10229a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7713 7900 bytes

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