Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf731b2d5155607…

MALICIOUS

PDF

72.0 KB Created: 2021-06-11 12:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3abd269510e9e2dd87c95b66ba172c49 SHA-1: aa8e4cbcdd153aef37810b5bef7bcdaff1df9021 SHA-256: 7bf731b2d5155607befb0bce680c6fabc544a43d884abe7c48dc734b16dba815
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm, suggesting a phishing or SEO manipulation attempt. While no scripts were directly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=nintendo+ds+emulator+pokemon
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcaa3f8a498c.pdf
    • https://bufoteno.weebly.com/uploads/1/3/4/8/134851237/5701038.pdf
    • https://static.s123-cdn-static.com/uploads/4369802/normal_600044a79b66f.pdf
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/wevififujogozu.pdf
    • https://cdn-cms.f-static.net/uploads/4420250/normal_60bd4b1a8f0c6.pdf
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fcbebcfbe5b6.pdf
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/5050820.pdf
    • https://fadowika.weebly.com/uploads/1/3/4/8/134847716/301e3e336da.pdf
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/13d51fc8e19c.pdf
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/gowapubugutigu.pdf
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/zozuvidujatewes-vemefan.pdf
    • https://saferuwakuzav.weebly.com/uploads/1/3/4/6/134688645/2193710.pdf
    • https://cdn-cms.f-static.net/uploads/4372105/normal_603d13a80587d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3252d39c-b58d-43ec-999b-c46f2522d8da/income_statement_example_problems_with_solutions.pdf
    • https://uploads.strikinglycdn.com/files/470287b4-3738-408e-9983-f063873020d6/sonru_bluetooth_5.0_transmitter_receiver_user_manual.pdf
    • http://sisiwovad.pbworks.com/w/file/fetch/145116822/espiritu_de_lascivia_en_la_biblia.pdf
    • https://uploads.strikinglycdn.com/files/72466869-aea2-461f-90c4-84a53c620c52/casio_gw-500a_replacement_band.pdf
    • https://uploads.strikinglycdn.com/files/54292642-15d6-4f24-8d74-a71d67380cee/singer_sewing_machine_model_533_parts.pdf
    • http://wenitat.pbworks.com/w/file/fetch/144874749/reduce_size_online_free_below_100kb__50____Low__2.pdf
    • https://uploads.strikinglycdn.com/files/39fc282c-9623-4ffa-88b4-507f5afeec84/53506397348.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbc.bin
692a41af86f460e919e0a1f91b6770398d7f7b72556eb233e1845ad1e79ad5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5140 bytes
font_01_sfnt_off0000ee1c.bin
30fcddba5d080fbe1f5ca410b6d425a93f1cb5198df37630805b3037e5717492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 11152 bytes

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