Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8d65621e1a574f…

MALICIOUS

PDF

72.3 KB Created: 2020-11-11 21:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5748c6152d92945f7eb3e252e0d17234 SHA-1: 589e55a65e98eebc22e1cf75de57b7895a6d388e SHA-256: de8d65621e1a574f6a0208ed84af493b759413c423f248fd765ca9560d4c8aae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm heuristic, indicating it is designed to host numerous external links. One of these links, 'https://traffnew.ru/123?utm_term=read-a-thon+mansfield+tx', is presented as a lure for a 'read-a-thon' event. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://traffnew.ru/123?utm_term=read-a-thon+mansfield+tx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f9b211befc7d.pdfIn PDF document text
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/5344118.pdfIn PDF document text
    • https://wijisozafepu.weebly.com/uploads/1/3/4/3/134356417/2561586.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/2159860.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/e0d88887-fe9b-4dd8-9edc-59c7cf452040/vanumofakabado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e338e4-2b96-473b-9604-6e5213c475d9/la_chn_no_dnh_cho_chic_bnh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e638d7a4-e62f-45a4-9d5a-c1e2c35143ea/kemafufugikowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca80bdd-2f94-46cb-a4a5-583e5f42b57d/4608258527.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/rrc_of_texas_public_gis_map_viewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eee6bad-e88e-400c-83fe-a4bd37ee1fa0/pokemon_card_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9255abc-3680-425f-8201-cbc3fa3e7e09/8396721864.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_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 4944 bytes
SHA-256: 4dce5d119b1554965c01f908bfe5bccf342a1f07b1fc461bba8ecb467cf1d703
font_01_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 12284 bytes
SHA-256: b5fd6dcf54694131453082f404ce6e0ed317accd4a70f2550160831f73271809
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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