Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2d59e2c11f56e2…

MALICIOUS

PDF

46.9 KB Created: 2020-03-10 15:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3af7e6d03c018141c5216df74ff820e9 SHA-1: 75c5e9e95bea48efa8f8c5ef02e8a22d89ff0444 SHA-256: 5f2d59e2c11f56e2586e745db525d874d5b28b4c6c0f1bb1c739b3b1861bb028
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, disguised as a diet menu. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm points towards a malicious intent to drive traffic 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://baseball.peakathleticsystems.com/uploads/1/3/0/6/130621998/130621998.html#blood+type+b+diet+menu
    • http://craftcritic.beer/uploads/1/3/0/8/130814298/6567420.pdf
    • http://caribeanfly.com/uploads/1/3/0/6/130604801/1567807.pdf
    • http://mta-sts.franklinrodandgun.org/uploads/1/3/0/5/130551720/dfabc92e8bd7.pdf
    • http://spectacleministries.com/uploads/1/3/0/6/130605471/7354020.pdf
    • http://www.stctools.com/uploads/1/3/0/5/130589312/632307.pdf
    • http://restapi.org/uploads/1/3/0/6/130622061/zimibijugovew.pdf
    • http://minoux.net/uploads/1/3/0/7/130739038/3832588.pdf
    • http://campchow.net/uploads/1/3/0/7/130775626/4405136.pdf
    • http://youralcove.net/uploads/1/3/0/6/130605115/941d2cfd316bd7.pdf
    • http://inspiration-in.com/uploads/1/3/0/6/130640061/8125636.pdf
    • http://toolmarket.site/uploads/1/3/0/6/130640003/4b30e0.pdf
    • http://sapphiremj.com/uploads/1/3/0/6/130621950/bases_xuvofez_sezoj.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_off00008e47.bin
7f5a4d15294b2d240dce33755faa8f78f2e94565f4dfdf70a2c8bbe987851e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E47 8552 bytes

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