Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c50740cda108078…

MALICIOUS

PDF

38.6 KB Created: 2020-04-06 15:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a479cd12bd2ca3ceacc5d9fa59468be9 SHA-1: 441180c6582a23fac099bb4e057edf7af23dfd50 SHA-256: 5c50740cda108078ad5101a14dfb97539e8545a7149a06cb1b8e346ec32148ec
96 Risk Score

Malware Insights

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

The PDF document contains a large number of 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. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to potentially harmful sites.

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://monarch-hc.com/uploads/1/3/0/8/130814984/130814984.html#cimbra+para+losa+nervada
    • http://shireinuchiorli.org/uploads/1/3/0/4/130476340/gugijuwofulosetine.pdf
    • http://spencerrabin.com/uploads/1/3/0/7/130775822/39219825f3240b6.pdf
    • http://mikestapelman.com/uploads/1/3/1/3/131380623/c6e5dfd57f52.pdf
    • http://certifiedreflexologist.com/uploads/1/3/1/3/131383921/8ec5e5693990920.pdf
    • http://the-wordsmith-academy.com/uploads/1/3/0/5/130545189/gawokusafa_bojapib_nasid.pdf
    • http://sisulife.shop/uploads/1/3/1/3/131398478/569a7904cd34139.pdf
    • http://sea-estacottage.net/uploads/1/3/0/6/130639714/d08173.pdf
    • http://wineandevents.de/uploads/1/3/0/4/130488338/6387449.pdf
    • http://artforhumanity.ca/uploads/1/3/1/0/131070447/63757.pdf
    • http://deannaheathrealty.com/uploads/1/3/1/3/131379268/70b4577b.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_off00006aa4.bin
2e14ea9c42d38d1c0f2dd7b546c3d9e3a92d3dd3c5c8115339dfbebbf52445c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA4 9388 bytes

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