Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e5dd988d231d87…

MALICIOUS

PDF

84.8 KB Created: 2021-03-21 05:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ab3941ed76bba4d41f75efd2bbc26bc SHA-1: 82e5b1ac0cfefd57cb77cda1adfb901fd22a91b3 SHA-256: 54e5dd988d231d872b5dd814c2c825f29d91cc0241627ec24b8e7ec63a1c2eed
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is jumiwimov.ru, which is likely used to redirect users to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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
  • 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://jumiwimov.ru/strik?utm_term=what+is+freelance+graphic+designer+job+description
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/70bf89b701f.pdf
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/kofego_bobetedagisatev_zaponogo.pdf
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/820eac3eb46.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/savexagewe-wuromevavo-zoradeva.pdf
    • http://ketorebagibof.22web.org/chest_tube_management_nursing_powerpoint.pdf
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/71bb715cba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dadupawo/97084057579.pdf
    • https://uploads.strikinglycdn.com/files/3a1e53e1-a3bf-495c-ac7f-617745842069/bose_wave_radio_remote_control_battery.pdf
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_85b440e9052e417c99e67c8f61dbf4ed.pdf?index=true
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_b48a7726a1614d9aa506cc9ad13210f6.pdf?index=true
    • http://bidavotajowev.epizy.com/bosch_1617evspk_router_plate.pdf
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_48e3f5dd16a64eee8a33f8364b1afc1d.pdf?index=true
    • https://s3.amazonaws.com/gomaxod/zewaguw.pdf
    • https://uploads.strikinglycdn.com/files/c6884e0e-f749-4e84-bdba-c5b5af4464ef/is_eleanor_and_park_going_to_be_a_movie.pdf
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_9bc1554a6c734473add3ee2eb16010d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3d7f66c-0e16-4a9b-bda5-9a45d791dea4/mepukanibubesifoveni.pdf
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_784074bbdf974549beeb4bb8a822ec82.pdf?index=true
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_c58c635c7c4146678cf7177483eb4ade.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_656638e0f7344ad4b669d25f021cafae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21f91464-f712-49de-afe5-1a55f042ea9a/north_indian_dishes_list.pdf
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_8eb7c4a99bfd42b68c0516d6bcd149e4.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_e2a52c1bbe164e8a8850f03caff78d33.pdf?index=true
    • 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_off0000fe2b.bin
9a07102f8326d78add6decd774a87fccbe9502910943f3aa42ae29f597bd79be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 5436 bytes
font_01_sfnt_off000110a4.bin
139817dda3166aa4b357c8e1f0fc9602bd87baced807a844d782f0f01861e794
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 11324 bytes
font_02_sfnt_off0001373a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 4324 bytes