Malicious PDF — malware analysis report

Static analysis result for SHA-256 696caefe2d738a87…

MALICIOUS

PDF

77.0 KB Created: 2021-04-08 14:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9958eed6620a89c3b492ff391eb574be SHA-1: 1859b03de2d6275cd301da67a5b764624cf62a9f SHA-256: 696caefe2d738a874c60f06e8dec07850d85300acff7591bd3b7b581749b42ac
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://seumenha.ru/strik?utm_term=biedronka+warka+winiary PDF link annotation
    • https://cdn.sqhk.co/tonufipu/b7TbHgc/trench_assault_mod_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/6U6x5gi/jelly_band_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/mjhihjc/skyscrapercity_avianca_el_salvador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_6063f17b82558.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/hid527v/summoners_war_rune_optimizer_windows_10_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_60047df4621df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_602920f00c871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_605f39688db17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toguvaju/bubewuzobumisegijekuzubo.pdfIn PDF document text
    • http://keximatefabuzi.rf.gd/90330882788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04b3a41-ff17-4eed-adab-92eb0c49491c/systems_engineering_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea71d0f-1982-4043-ad5a-efcd2d623e7e/dekinu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/58997587075.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/adobe_after_effect_bagas31_2017.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_ee9abeafe3ac4030ad2d041e89ca8fba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8526e1bc-5360-4ddb-b68c-7abaaaac5217/how_to_install_a_rheem_tankless_hot_water_heater.pdfIn PDF document text
    • http://wazisogu.rf.gd/67850491896.pdfIn PDF document text
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_63ed041e4a0a43caac4a9b9e915dab16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/navien_npe-240a_maintenance_kit.pdfIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_f7c03a4da957419fa4d7eeda8c8855ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd2a276-995c-47bc-859f-1a7cc1d1acb5/mefiruzibebumazowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c5f455-a025-45f4-9ace-ec7ffb675b8f/what_should_your_beta_hcg_be_at_2_weeks.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_16ab4298c0a747ebae203ff390aa23b7.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 4916 bytes
SHA-256: a2cf63629ba8d76ecf0153178db0314a75199ae8167037907cc7d02299ef33fc
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 12652 bytes
SHA-256: a60a498d278e1d205452ffeea72cbaef1ac29d463dc9a85fdb903c09a1f56fda