Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda1c65a55f6da77…

MALICIOUS

PDF

35.0 KB Created: 2020-06-14 11:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b0577606fdf42ec573e2b5f67b27b9 SHA-1: f2c65bfe4228ff216476c555338e362f6de6f08a SHA-256: dda1c65a55f6da77c03a8dcba509dfb5a8e43c663993919415df57ba5471bff1
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to a 'Website marketing guide' and includes several of these external URLs. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content or for SEO manipulation.

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://epaprofessionalhome.com/uploads/1/3/1/1/131163854/131163854.html#website+marketing+guide
    • http://kingstontowingco.ca/uploads/1/3/0/7/130739597/7557175.pdf
    • http://rahellimor.com/uploads/1/3/0/6/130620893/zugaj.pdf
    • http://webmail.tn-arts.com/uploads/1/3/1/4/131437425/jeloj_bafijokuxemaga.pdf
    • http://cpanel.ultraimagingsolutions.com/uploads/1/3/0/4/130483275/xilesupukiras-resufepu-sisok.pdf
    • http://ayenmall.com/uploads/1/3/1/4/131409861/8e03ad.pdf
    • http://revsurfco.com/uploads/1/3/1/3/131380636/6011550.pdf
    • http://newalbanydistrict.org/uploads/1/3/1/0/131070859/tunojiwu-kugekepa-zanibitatuwag.pdf
    • http://onertgroup.com/uploads/1/3/1/3/131379598/299a1a25.pdf
    • https://lotodirod.files.wordpress.com/2020/06/gigopirowamarosez.pdf
    • https://wilotulu78917961.files.wordpress.com/2020/06/85995240813.pdf
    • https://zogewuvoxer.files.wordpress.com/2020/06/jefuzirinoz.pdf
    • https://muwunonuraw.files.wordpress.com/2020/06/raduvifenetuvajexipagakun.pdf
    • https://lareberu519560336.files.wordpress.com/2020/06/gigavakanajijodux.pdf
    • https://xunuzivediji.files.wordpress.com/2020/06/davomejapavugibe.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_off00005f5b.bin
4f1c638d56d25ff4c40a488789a8207535021a00f88205492c480e65e4ebc08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5B 9868 bytes

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