Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5ef42681283c8d…

MALICIOUS

PDF

47.2 KB Created: 2020-06-03 21:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e08199a83fd885c4d74b23cb4c1515a SHA-1: d28e060c6d256a2a219de700a6d5618cecd35550 SHA-256: 6e5ef42681283c8d6e5a9ec59cffd6053c3a7ff7dd29956630d4f09c5287b56e
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or redirection mechanism. One embedded URL, 'http://duanyministry.org/uploads/1/3/0/2/130289161/130289161.html#keto+diet+food+list+for+beginners', is presented within the document body, likely as a lure. The ML classifier strongly indicates maliciousness, and the PDF structure with mass external links is a known tactic for SEO poisoning or distributing malicious 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://duanyministry.org/uploads/1/3/0/2/130289161/130289161.html#keto+diet+food+list+for+beginners
    • http://tcuic.com/uploads/1/3/0/4/130483207/sizuzakuga.pdf
    • http://mta-sts.newtongeorgiadems.org/uploads/1/3/0/4/130476700/9501716.pdf
    • http://michaelslivkaart.com/uploads/1/3/1/3/131378950/7238208.pdf
    • http://pioneergeneralcontracting.com/uploads/1/3/0/5/130542863/9468206.pdf
    • http://laroutedusens.com/uploads/1/3/0/4/130488539/d393f848d537fff.pdf
    • http://duanyministry.org/uploads/1/3/0/2/130289161/terms.html
    • http://duanyministry.org/uploads/1/3/0/2/130289161/dmca.html
    • http://duanyministry.org/uploads/1/3/0/2/130289161/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kujemix.files.wordpress.com/2020/05/sivatazujenasibagupenef.pdf
    • https://danudux.files.wordpress.com/2020/05/supodevekadazan.pdf
    • https://nifuvosekag.files.wordpress.com/2020/06/xutagafevaj.pdf
    • https://xizisorizev.files.wordpress.com/2020/05/rirekita.pdf
    • https://loxijesuvoti.files.wordpress.com/2020/06/jorital.pdf
    • https://rebenesorove.files.wordpress.com/2020/06/5797411300.pdf
    • https://wupefosa.files.wordpress.com/2020/06/65464746452.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bdd.bin
ec705b27fa035eb2e291c81311c018e370ece66476a3bbc9dd4601e2fe677392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDD 10820 bytes

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