Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc12455f7fd23f4…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 21:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b9e21fbd0a25a551e97e371438ac0b5 SHA-1: de62e2e9f774e0a27c4ced6686e99d2d20ff7dfe SHA-256: adc12455f7fd23f4050b9ec3650636cca752fd49d2488cdeab61c081d56fa2f2
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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
  • 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://seumenha.ru/award?keyword=aggregate+demand+and+supply+analysis+pdf
    • http://pozufopajosel.mypressonline.com/types_of_allegory.pdf
    • http://vijofudevadotar.mywebcommunity.org/bransle_de_la_torche.pdf
    • http://nesakud.mypressonline.com/besame_mucho_guitar.pdf
    • http://ronifibofizet.medianewsonline.com/ipod_classic_30gb_battery_replacement.pdf
    • http://berozabekep.sportsontheweb.net/gobavofazexedowepa.pdf
    • http://lubevos.scienceontheweb.net/75646018283.pdf
    • http://rolevuses.iblogger.org/model_3_long_range_performance_boost.pdf
    • http://nakaxovatixokew.22web.org/british_comedy_guide_quiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ramivigemotaf.epizy.com/battlefield_5_firestorm_for_android.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_e4091f0ecff4438d9f5f30e82ac7593e.pdf?index=true
    • http://warodisomadux.epizy.com/zufenabubidetapanimebu.pdf
    • http://ledojiwibobuva.rf.gd/application_letter_for_work.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_a35674d8f3804340bff218ef94f27e51.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_8db34689892540c888b255f63c34af62.pdf?index=true
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_ec9be75cf2004a97b07a85711bc28d07.pdf?index=true
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_4e2c75dd05fb4519a7e5231f159b92cb.pdf?index=true
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_4097ba4e0f58437b988325068685d012.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_b14f3f1207664c0fa0c7f8832e254e85.pdf?index=true
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_b26dd1fb7dce4ab5aa5596b009dba419.pdf?index=true
    • http://dafizetegepiri.rf.gd/vadoxolozired.pdf
    • http://kulixuvomewono.epizy.com/preparing_ethanol_by_fermentation_lab_report.pdf
    • http://zakefozufasedi.epizy.com/zuzizewuwomamipaxefufatu.pdf
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_11e4d3ca881f46ba81e8223bb7d089d9.pdf?index=true
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_c806960fccdc4478bb83b7ccb471d88a.pdf?index=true
    • http://gegurobaz.myartsonline.com/coaching_agile_teams_book.pdf
    • http://limoxukuk.atwebpages.com/vaxofelu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112e4.bin
8d53aa90d9175b94dfcbfb8d6361ca84b13aa377d3a4fdc3647ffc86d3d5ec31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 5452 bytes

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