Malicious PDF — malware analysis report

Static analysis result for SHA-256 e475379a9eb91bb5…

MALICIOUS

PDF

35.3 KB Created: 2020-06-14 16:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5974c443da37e31d5143c8265271a9 SHA-1: 43d308baa17412ab675a9f4c87f032f73bfe261e SHA-256: e475379a9eb91bb511fee54374471216d5278f204e002c9f99067dc6b753c48b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains designed to host SEO-optimized PDF files. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Ironman pepakura pdf' and the URLs suggest a link farm or redirection scheme designed to lead users to potentially 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://armorzon.com/uploads/1/3/1/4/131454264/131454264.html#ironman+pepakura+pdf
    • http://privacysteps.online/uploads/1/3/0/8/130814754/baa2e749a5a4a6d.pdf
    • http://buddyguardsco300.com/uploads/1/3/1/4/131437981/xigubupunurux_riremiloniwafe_rugipifalalam.pdf
    • http://homeandofficedisinfection.com/uploads/1/3/0/5/130544191/c768125bdec.pdf
    • http://bottlecapmultimedia.com/uploads/1/3/0/2/130273623/09d706bb09d0.pdf
    • http://homerepairthornton.com/uploads/1/3/0/5/130544318/4878581.pdf
    • http://hostmaster.oschuchoes.pt/uploads/1/3/0/6/130620202/f918b3.pdf
    • http://74-123-75-158.mgwnet.com/uploads/1/3/0/5/130590770/1727409.pdf
    • http://mta.safehavenworship.com/uploads/1/3/0/7/130740492/kuxavanu-kijunezavo-zifab.pdf
    • https://xevugonabaw.files.wordpress.com/2020/06/tetupakibonobi.pdf
    • https://kuziwugajeko.files.wordpress.com/2020/06/gugakewi.pdf
    • https://gatagowilij.files.wordpress.com/2020/06/rebukijerobodajona.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_off00005a7c.bin
7306365fccc751c27607c686087652cd7470d0c4feaf6f066039dbd61fceb1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7C 11244 bytes

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