Malicious PDF — malware analysis report

Static analysis result for SHA-256 2686c3f9e8ba91d3…

MALICIOUS

PDF

73.1 KB Created: 2020-11-13 23:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3981e2a79a7615fc3885a79577a0adeb SHA-1: 2dcf67f349aaaa85783448f3ced40bdfee52c831 SHA-256: 2686c3f9e8ba91d34102f0d846e10dca419016d518f21b273f4fd3ad8b886d6b
136 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One prominent URL, 'https://trafftec.ru/123?utm_term=planet+of+the+apes+characters+names', is flagged as a redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 https://trafftec.ru/123?utm_term=planet+of+the+apes+characters+names PDF link annotation
    • https://tenaxegib.weebly.com/uploads/1/3/4/5/134583113/2589228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fabfa5c0fbb1.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/1c638f.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/jonopasokerexe.pdfIn PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/6641822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/53aa4c4c-8420-4b44-bde7-928a2f092e5a/the_dc_comics_guide_to_pencilling_comics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429a461f-879e-4299-bf13-6beae850d8b6/86805913564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87736278-a9c5-4913-87a5-99f214e85ea8/hunter_welly_socks_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74075dca-d946-4b77-b0c8-2f94f01c594c/vupog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719b6300-d652-4c38-bee0-7a3d6e2d0755/33519015734.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 4996 bytes
SHA-256: 7e5ac11237af3503b8c4ba5ec97d90d56e897f29dc0e8f43c32042b89a4f7937
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10524 bytes
SHA-256: 6b63e28e6d956703287a28401bb97ea7b7bfe465c85a1e36ec4b871384663189
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3