Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdab6132b1701eb…

MALICIOUS

PDF

88.7 KB Created: 2021-03-18 01:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 603e24c9763ebcab1048f0aaabba3f6b SHA-1: ea648006b710906c52cdcfc82dfed5b6423eae9d SHA-256: 4cdab6132b1701eba596f210f0182bfc728fe26c53c7f61fb0037c81ce941001
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm heuristic indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=what+is+the+main+focus+of+cognitive+psychology
    • http://pekibexuvipeve.scienceontheweb.net/dk_ching_building_construction_illustrated_free_download.pdf
    • http://lerasusakibura.22web.org/biomateriales_dentales_libro.pdf
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5ff37ea0042ef.pdf
    • http://miribut.mywebcommunity.org/samsung_electrolytic_capacitor_datasheet.pdf
    • http://kixiwogazu.sportsontheweb.net/samsung_rugby_2_sim_card_size.pdf
    • https://cdn-cms.f-static.net/uploads/4408712/normal_602ad2cf321cd.pdf
    • http://zereteleriw.getenjoyment.net/75376883887.pdf
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fdecaf258dc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedimuta/cancer_discovery_author_guidelines.pdf
    • http://bufijonewufo.onlinewebshop.net/d_d_3._5e_character_sheet.pdf
    • http://mosepurone.epizy.com/31256408400.pdf
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_94687229eca04775b14bf6910ea4fab0.pdf?index=true
    • http://gomugugagaf.onlinewebshop.net/zugozo.pdf
    • https://s3.amazonaws.com/vavale/begegubefevutef.pdf
    • https://s3.amazonaws.com/jedobufudajewu/online_quran_teaching_jobs_in_pakistan.pdf
    • https://s3.amazonaws.com/gogoxowiniza/nusuzekemagokajobuke.pdf
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_0b59d03f0262436f8e31267a9365ef84.pdf?index=true
    • http://sovizurimi.rf.gd/acer_gaming_laptop_price_list_philippines.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_b9d3cd9c1b414c88af78b6b00772a7b6.pdf?index=true
    • https://s3.amazonaws.com/rupatojuko/craftsman_pro_series_10_contractor_table_saw_reviews.pdf
    • http://raxajabidadida.onlinewebshop.net/belkin_n300_router_software_download.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc5.bin
cc9cb31d40624740ef936c9bda7ad83d9e7ab546b87b7395c2270cb6e10031e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 5508 bytes
font_01_sfnt_off00012f7e.bin
f6ecacb488bc6a603bc50a206492f022bf2bed7e2acd2196b6079f5c77779321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 11172 bytes

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