Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1fdb6816be576e…

MALICIOUS

PDF

81.2 KB Created: 2021-04-13 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9ec9987ba1eb317bb4b47ecf53c5bd21 SHA-1: 31b7aaec9dfd7f58914fb37f95ef89cb2b677a7f SHA-256: 3c1fdb6816be576e9af92d0c45462df40f4447e0e6cc96f0c124a10ce824dca8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The primary malicious URL identified is jumiwimov.ru, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=considere+o+diagrama+de+fases+do+dioxido+de+carbono+co2 PDF link annotation
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/zaxawel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5fcc0b88c13b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_5fdd9c8fd93f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_6036dcc443d4f.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/8244615.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/9681054.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/dasowamon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60444b133eb51.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/xofelup.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/7507913.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/4927335.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/4019257.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/gisanilimifumivuzap.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/fbe7acf4-57a0-4867-9f41-7e32290e3f1c/2006_chevy_equinox_ac_fan_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d048352a-c1dd-4584-a71c-e105f92aa250/75720966262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c15e6f-4439-4fec-9cf6-f70afdc247dd/que_hace_un_taller_mecanico_diesel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ba6eae-7f66-47b1-bb63-312e9ee2fa3a/ryobi_2000_watt_inverter_generator_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf3cba2-f6a9-4e04-9c1b-6b3f7226809a/what_are_the_three_largest_rivers_in_north_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185c3318-21ff-48f2-997f-e45bc8f35ccd/2000_ktm_250_exc_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f6b9b0-e812-4a0a-89e4-fd6f9d1ec3f4/black_and_decker_weed_wacker_spool_cap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46376fca-8b1c-4731-8c3d-4941ab86fd1a/43340372959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d27cbf-1b7e-443b-bd87-7de71b5ef572/why_does_my_sony_tv_not_turn_on_sometimes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 5380 bytes
SHA-256: f90e22e4e645e27edb0cbc87d2c23a735b1a23903330b813d9287c747730e001
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 12900 bytes
SHA-256: b2b0986dac131bcc0c6f7c06dcbe94f0d3668d465952584723e8288d8b3131c5
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190
font_03_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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