Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc43a7019711a25…

MALICIOUS

PDF

41.1 KB Created: 2020-04-13 15:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3026fd9207f1e438f1e1d4faf2a718e4 SHA-1: f05de5f74ad0d8ca5666fe47bf540ac1fe543599 SHA-256: 0dc43a7019711a251ef52b4618b7f1065a710e894096136541d797718726d0d5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous external URLs suggests a potential for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://elegancelights.com/uploads/1/3/0/7/130775119/130775119.html#ecuaciones+diferenciales+de+primer+orden+introduccion
    • http://arete-managementsolutions.com/uploads/1/3/1/6/131637870/tikimovo-nodeziwugidar.pdf
    • http://thebandbaltimore.com/uploads/1/3/1/4/131453847/fijebek.pdf
    • http://welcometoautomation.com/uploads/1/3/0/3/130379590/1597909.pdf
    • http://mkfmetals.net/uploads/1/3/1/3/131383383/xorebowusuvevegugu.pdf
    • http://facebook-marketplace-9485734635234634.com/uploads/1/3/0/6/130639933/jofusofuliwelon_divodopapo.pdf
    • http://jujelalzle.site/uploads/1/3/0/7/130775447/eac73.pdf
    • http://justfunnails.com/uploads/1/3/0/6/130621301/3313646.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_off00007748.bin
4a00e9730d8545d5029a9f2f819cb0ef01dd4b30644c86d526897037efa78b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 9264 bytes

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