Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba111baa5545ff5…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 16:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed7f801aaa04bc27a8a32674a08be709 SHA-1: d92733414393fb04a93159d66a2321763373e115 SHA-256: aba111baa5545ff5f1a498a0030489c5d8218d04de68e5003504f83f989389ac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'seumenha.ru/strik' and a 'utm_term' parameter suggesting a phishing or malware distribution campaign related to 'osha 10 hour construction safety and health training'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for link farms, reinforcing the malicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=osha+10+hour+construction+safety+and+health+training
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/2373644.pdf
    • https://static.s123-cdn-static.com/uploads/4369765/normal_6000281f59938.pdf
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/biwosovinusene_lirimojusak_dipupogixelopor.pdf
    • http://interbank.link/how_to_calculate_the_surface_charge_densitydu8ji.pdf
    • http://persequen.com/virtual_dj_mixer_2019rnqvm.pdf
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fde9f14e62b5.pdf
    • http://xamoxipuwizutux.scienceontheweb.net/87887024531.pdf
    • http://mirumumavetifun.mypressonline.com/java_struts_interview_questions_and_answers.pdf
    • http://debikina.22web.org/tukamuzidiradugafaviner.pdf
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/metovuse_sixefefu.pdf
    • http://dalosizofovabes.medianewsonline.com/bach_magnificat_esurientes.pdf
    • http://sanelobazigi.medianewsonline.com/injection_bijection_surjection.pdf
    • http://zibodotuf.mygamesonline.org/dir-655_latest_firmware_version.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pezefaxovojole.atwebpages.com/55330128739.pdf
    • http://segimoto.myartsonline.com/communist_manifesto_seize_the_means_of_production.pdf
    • http://sokagozu.rf.gd/erisa_guidelines_plan_year.pdf
    • http://datidalumoz.rf.gd/download_bhagavad_gita_in_tamil_in_format.pdf
    • http://zedebegeku.myartsonline.com/carti_despre_antreprenoriat.pdf
    • http://fapujeg.epizy.com/nalonalutinimofefitufeje.pdf
    • http://raseloxezonavo.epizy.com/harwich_haven_authority_annual_report.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_off0000f582.bin
92c89c7f689539d1936c9a232cd4c415e335c47c3b9af35e40688091fe3a9e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5608 bytes
font_01_sfnt_off00010898.bin
dd6d3e90cbf55e8f56a02a237b3029e0763c35105bbf175f0c98751bf6e9bba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10852 bytes

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