Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f7908da6ae5875…

MALICIOUS

PDF

36.3 KB Created: 2020-06-16 09:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68bfa791fe41cc3fed62cab0c0c849f SHA-1: e21b1d2c0063f143689ebcbb9c9ee6832c890f45 SHA-256: d7f7908da6ae58752ca6f2fe9aaaf9f8c2c54f87ae643c8916e7183f95903e5f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous suspicious URLs points to a malicious intent, likely to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://angelsandarrowsboutique.countrysiderefind.com/uploads/1/3/1/6/131606309/131606309.html#compress+pdf+files+ubuntu
    • http://dreamfreq.com/uploads/1/3/0/8/130815482/8838d4d20dd2177.pdf
    • http://johnsonprotec.ca/uploads/1/3/1/6/131606758/jufutida-dukopajevov.pdf
    • http://dmuaraonline.com/uploads/1/3/1/1/131163550/dalawaxu-boperem-refatozonapuro.pdf
    • http://derrettphoto.com/uploads/1/3/1/4/131437567/dejitilok-vugunoregitej-xizubo.pdf
    • http://starspangledbabe.com/uploads/1/3/0/8/130813601/8867b9bf7.pdf
    • http://surge2go.com/uploads/1/3/0/6/130640003/7669322.pdf
    • http://organizzaremusica.info/uploads/1/3/0/7/130775134/kuximi_pafuwoxiwewuv_gibajuwuxeki.pdf
    • http://recruitingbasesoftware.com/uploads/1/3/0/8/130813796/8ee1b.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.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_off000063d7.bin
51cc1eb0ab289cfe4c2aff2d5df3eb75a411085efab4e657701965be07481fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 10128 bytes

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