Malicious PDF — malware analysis report

Static analysis result for SHA-256 67da32d118f9412b…

MALICIOUS

PDF

46.2 KB Created: 2020-04-12 13:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0a84511b300526135c77b6d74ce90e0 SHA-1: 109391f451e5b70027040172da8054297b5ab7b2 SHA-256: 67da32d118f9412b85e876cbdbcf37bb7f3bdd1095a41c1de21e6a75a0df27e3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external URIs points towards a tactic to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the PDF's structure and link farm heuristic are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tulumba.ch/uploads/1/3/1/6/131637635/131637635.html#modelos+organizacionales+mercadotecnia+produccion
    • http://capegardeners.com/uploads/1/3/0/5/130590578/notane-duzaloselisapi-kejar.pdf
    • http://coolbeanslab.com/uploads/1/3/0/7/130738785/93dd29af83.pdf
    • http://qualitysafetysystems.com/uploads/1/3/1/4/131483067/82d92761.pdf
    • http://estrategiaycoach.com/uploads/1/3/1/3/131383464/xojij.pdf
    • http://verfex.com/uploads/1/3/0/5/130590030/9086013.pdf
    • http://essegiasrl.it/uploads/1/3/0/5/130590297/8449455.pdf
    • http://eatactivenutrition.com/uploads/1/3/0/6/130603851/lifetotu_zanusigowoji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000816b.bin
a7f3a35f724d1667ae5428b9bf6456f6b6ad564caf91120bb63e851c1b7f0bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 8760 bytes
font_01_sfnt_off0000a168.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA168 2600 bytes

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