Malicious PDF — malware analysis report

Static analysis result for SHA-256 da731e0e1fda7321…

MALICIOUS

PDF

67.6 KB Created: 2021-01-12 10:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53501d710ae5b6642d6e08157037e6a SHA-1: 66cee0ebdf49061060805dfa72bc68c548ad0129 SHA-256: da731e0e1fda73218b62ed4a1f724e7f76a862db346e3eba2f4c643335225f53
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and content suggest it's designed to lure users into clicking these links, potentially leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=etv+guide+29+september+2019
    • https://site-1175981.mozfiles.com/files/1175981/92620205509.pdf
    • https://site-1168289.mozfiles.com/files/1168289/ninja_tobu_warmonger.pdf
    • https://cdn.sqhk.co/lirerafi/gfggVji/42892792759.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fd134abab693.pdf
    • https://site-1178336.mozfiles.com/files/1178336/pixel_force_2__4__4_mod_apk.pdf
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/9361322.pdf
    • https://site-1245980.mozfiles.com/files/1245980/3rd_grade_math_practice_printable_worksheets.pdf
    • https://site-1166657.mozfiles.com/files/1166657/62579431959.pdf
    • https://site-1178549.mozfiles.com/files/1178549/dragons_rise_of_berk_cheats_2020.pdf
    • https://site-1172679.mozfiles.com/files/1172679/15279405085.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f402.bin
20f8e895deb1ad50060af2826cb8d3a944d74dc55bcb46f4a668218e7fb48c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5676 bytes

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