Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df4635f657550b…

MALICIOUS

PDF

84.1 KB Created: 2021-04-01 05:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 507c7a3413e0f525882ec6d62f221bd2 SHA-1: d35419dd633ff3f5877240328d31245a7b6cf129 SHA-256: 45df4635f657550bdc53a006e3693a47fc4f2ea249a1c2f51e96fb958557e01f
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 hosting or link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to phish credentials or deliver a secondary payload. The document body, though heavily obfuscated, references an 'answer key', a common lure for educational-themed phishing.

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://vilenefex.ru/strik?utm_term=algebra+with+pizzazz+did+you+hear+about+answer+key+page+211
    • https://cdn-cms.f-static.net/uploads/4488316/normal_601a2e6da5249.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6012279e154fb.pdf
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/sasixepixolokizu.pdf
    • http://zapemik.iblogger.org/64178968673.pdf
    • http://jobs-ingenieur.best/formula_para_regla_de_tres_en_enfermeriaojvim.pdf
    • https://xikunamoveg.weebly.com/uploads/1/3/4/5/134596382/teweniputub.pdf
    • http://premium-cinema.com/does_costco_install_garage_doorswiw4j.pdf
    • http://lighttravel-ng.com/hipaa_dispute_letter_templatelp24e.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_600d192ee641e.pdf
    • http://mpvideo.org/property_and_casualty_insurance_study_guide_texas93xh4.pdf
    • https://gixopujo.weebly.com/uploads/1/3/0/7/130775076/simajeninil.pdf
    • http://ayazshabutdinov.club/lagu_adlani_rambe_seberkas_sinar_wapkafy6j1.pdf
    • http://siankaanmexico.com/shimano_nexus_8_shifter_manualc2huz.pdf
    • http://evilcheats.fun/power_jack_8000_watt_inverter_manualppapr.pdf
    • https://cdn-cms.f-static.net/uploads/4487424/normal_605f6aa24c124.pdf
    • http://top-odejda.com/xigebavafejegas4cgwe.pdf
    • https://rusipowesurajuk.weebly.com/uploads/1/3/4/5/134520473/5842591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nuzejotegaze.rf.gd/furosemide_drug_guide.pdf
    • https://s3.amazonaws.com/tobito/73492253722.pdf
    • https://s3.amazonaws.com/tesasubawalozan/3591561918.pdf
    • http://zaxalamel.rf.gd/39071440349.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf0.bin
d7bc29011597338255fceb366f9bbdd3c3377abfea077f41afd15f36ede0bba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 5724 bytes
font_01_sfnt_off00010f76.bin
f82a3db3ddd5181a4301320e5f6e971918b0a93600476b4cbb689269d9b56c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 10880 bytes
font_02_sfnt_off000134b1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 4324 bytes

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