Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8606da53e5002e…

MALICIOUS

PDF

75.8 KB Created: 2021-02-15 12:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f10ed1e8fca3dfb8a422e2a5c6485ad1 SHA-1: 6f9df7adf1c4dc9eafdf0856ad90c5860e4e180f SHA-256: da8606da53e5002efd12a7fc0f9d00dda3b40da2f5faacf936f05c1e3edcbb94
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=math+problems+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/nixibaraje/djjjcSW/bemanager_be_a_soccer_manager_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/rpjageX/bopud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd3143caa5b2.pdfIn PDF document text
    • http://grandov.pro/intensive_vs_extensive_properties_worksheet_answersr68cy.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/ixshdhc/elements_of_art_definition_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/nujizeres/hjiigtQ/16693966492.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/pjfgfdD/idle_zombies_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60158fc3858c0.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxazutiri/hlBbbU0/basketball_hoop_for_pool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495694/normal_5ffc1ae882619.pdfIn PDF document text
    • http://labiosdewonda.com/sparklebox_letter_formation_glvza3.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/hb0LWgd/75763456081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_5fd2eaaad0cbd.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/79821543001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_5fe8f02aef54f.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/Widgeib/compare_rechargeable_hearing_aids.pdfIn PDF document text
    • http://imedo.ru/81060100792ff773.pdfIn PDF document text
    • http://pixelbarista.com/kimuwigigivikananugagosudeoyga.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/38jiZid/one_gotta_go_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokemunerepefu.rf.gd/bangalore_metro_map_2018.pdfIn PDF document text
    • http://pabenikazugaj.rf.gd/bopigevanalu.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/95419958205.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5516 bytes
SHA-256: 44dd315ef1343ec8f0f9e5573a0f7f88d7fc009ac1270d07a1b4c892c927c949
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10840 bytes
SHA-256: 2bbf8c4dc20c981a75c8d7440fa89a333e204474d0952718058cc7bd3a5a8cae

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