Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85fb3a3b653f723…

MALICIOUS

PDF

77.2 KB Created: 2021-05-13 21:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 956c6082760a128dbac8d29f72d9a586 SHA-1: 976888f8bd2da9d3956b1b07068cbd565d18dac2 SHA-256: b85fb3a3b653f723edf657d6c02397e0638f53c6f13e890462a89844b5d8f94b
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an external URI pointing to zajinet.ru, which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains text fragments that, combined with the 'SE_URGENCY_LURE' heuristic, suggest a phishing attempt. No scripts were extracted, but the presence of malicious URLs and the overall detection profile strongly indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=vizio+sb3820-c6+review+cnet
    • http://medicinfo.online/samsung_grand_prime_plus_price_in_pakistan_202011hsx.pdf
    • http://winnerslm.space/how_to_keep_a_date_worth_keepingaiu19.pdf
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5fe78c9c93dda.pdf
    • http://egrn-order.online/5667503968774m9j.pdf
    • https://cdn-cms.f-static.net/uploads/4366036/normal_606c9bc8c2982.pdf
    • http://select-get.top/account_manager_google_apkhohck.pdf
    • http://biolinkus.me/985737975530kffl.pdf
    • http://koreatop.ru/navenitisixorogimu3ojkd.pdf
    • http://sushibara.net/35291194684i0752.pdf
    • https://cdn-cms.f-static.net/uploads/4413369/normal_6069cda9e56b2.pdf
    • http://eu-study.ru/60041883231tovov.pdf
    • http://copyrightsafetyhelps.com/snow_white_with_the_red_hair_season_2_episode_11kl5l7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxuvagal/balancing_chemical_equations_practice_problems_with_answers_class_10.pdf
    • https://uploads.strikinglycdn.com/files/12083793-c2ab-4ba0-9931-b9c57eb18e51/dewalt_pressure_washer_hose_3400_psi.pdf
    • https://uploads.strikinglycdn.com/files/da5f322c-84b9-4fac-ac6b-1eca38168d47/rangers_apprentice_books_7-12.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_ec8aeb4b7a714103a462b6bdf6be7a47.pdf?index=true
    • https://c0a2105b-6e3e-4cea-99b9-04a673ef05b0.filesusr.com/ugd/87b9a8_ef0bf9ac92384953bbc43dfcff227a3c.pdf?index=true
    • https://s3.amazonaws.com/pevuwarobuvowa/48304080231.pdf
    • https://uploads.strikinglycdn.com/files/80bd3a81-8139-4d28-9485-a212cc7d2add/does_wendys_sell_burgers_all_day.pdf
    • https://uploads.strikinglycdn.com/files/f8c77ee0-da85-4e6b-8467-9bd76af8f656/manual_reloj_casio_aq-s800w.pdf
    • https://uploads.strikinglycdn.com/files/eda0dd41-1623-4f9c-bdfb-f1f5911bb72f/samsung_55_inch_plasma_tv_weight.pdf
    • https://s3.amazonaws.com/ziwuvijevo/xijoxiz.pdf
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_0e2b265d9edb4df7b64363934525b9ae.pdf?index=true
    • https://s3.amazonaws.com/jezekemunidup/24644606536.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_off0000ebdd.bin
89ce909b2a7bacbd7ed33d179ecc5d8dbe79610addb18823b1a72c34fb354df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5676 bytes
font_01_sfnt_off0000ff64.bin
3c43bf4dbac49d7e731b111b4b92dffb55ac54ec2829ef9e086297bd59a56fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 11656 bytes

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