Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f8dd39cf9c4cf…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 18:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b3c90db1d79f80e7827c969365836d SHA-1: 754bff00b62cee8a7a029344b0b4babb3f16a0d1 SHA-256: f39f8dd39cf9c4cfffe311ab241548d2f1e41d8e02602d5a55d96eb96ff9ea5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, suggesting a link farm or a phishing lure. The primary URL identified is https://baarspo.ru/123?utm_term=africa+country+list+pdf, which is likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=africa+country+list+pdf
    • http://belplitka.ru/the_4_types_of_writing_stylesjgwef.pdf
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6043e77ebca1f.pdf
    • http://meblik.su/how_do_i_program_my_panasonic_phoneekbac.pdf
    • http://kiviramezu.22web.org/dodge_durango_towing_capacity.pdf
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601649599e37b.pdf
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff5b72a44618.pdf
    • http://mexicotop.xyz/my_smart_horse_tafeldiplomamu4nz.pdf
    • https://cdn.sqhk.co/lunabati/ghgdyih/kekipevukuwuzipo.pdf
    • https://cdn-cms.f-static.net/uploads/4425230/normal_6054dc05563f0.pdf
    • http://raisinshub.club/zazuwopibipetavefaxizati3slfm.pdf
    • http://rifimakegezibor.22web.org/patuposilomiw.pdf
    • https://cdn-cms.f-static.net/uploads/4382773/normal_605d333b38265.pdf
    • http://govakokes.22web.org/71196242977.pdf
    • https://cdn.sqhk.co/kogujipubap/jgevLha/mezijuga.pdf
    • https://cdn-cms.f-static.net/uploads/4387810/normal_60148bd3a76dc.pdf
    • https://cdn.sqhk.co/vopupevomate/aYdBbUr/disney_heroes_battle_mode_best_arena_team.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_6032df7cf357b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_904a884491ef403782da9e767a739467.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_d99ac4c78ead4da0bf54c20db37e7bba.pdf?index=true
    • http://xezujuwevan.epizy.com/beauty_and_the_beast_serie_tv.pdf
    • http://ramapenutizawa.epizy.com/google_docs_fillable_forms.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ab.bin
3a5e3d0c47ec86cbec3ae111675b4aa07bd6088327a8bbb1ceab8254a82ca1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 5004 bytes
font_01_sfnt_off00010ab8.bin
6d169e7ea52af31b5459de2fec6ab320c6c3186cbae1595083baa7d07bc74581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11492 bytes
font_02_sfnt_off00013148.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 4324 bytes

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