Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a65823f67062d23…

MALICIOUS

PDF

141.9 KB Created: 2021-03-18 07:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6cf232d736356c3750049a4f17178631 SHA-1: 757e98386456c0ae37e42e73454e4c7c4b8d4148 SHA-256: 3a65823f67062d23cd6be3d349acadc04d65dde1770bd25bd27d7eb69d449bb9
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It also features numerous external URIs, with one specifically flagged as a redirector on disposable hosting, suggesting an attempt to lead the user to a malicious site. The presence of invoice and callback lures further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/strik?utm_term=olive+plants+co+op+lagrange+ga PDF link annotation
    • http://opt15.ru/the_hound_of_the_baskervilles_summary_in_hindi5dm2m.pdfIn PDF document text
    • http://homearfes.com/6994021278401ugr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_600e47f08a708.pdfIn PDF document text
    • http://meetsoda.pro/maytag_quiet_series_300_water_not_drainingw7omu.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/hcXUiaX/basketball_strength_and_conditioning_workouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_600be4bb65705.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/2ijhjij/miniclip_battleship_general_quarters_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/8rgdheD/jisopakuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunofalogejutu.epizy.com/45675330194.pdfIn PDF document text
    • http://riluromeni.epizy.com/b_d_singh_genetics.pdfIn PDF document text
    • http://modudupudabu.rf.gd/47065773363.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/penn_foster_computer_programming_languages_certificate.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/anatomy_and_physiology_coloring_workbook_answers.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_9e6ad85907d34a06b824c297d6401ce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/tosozizujokukamewabifol.pdfIn PDF document text
    • http://pimeduzuruwoboj.rf.gd/jorawikipavibenujibunume.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/akreditasi_puskesmas_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/58775320766.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_f997e172fb474c828ee36593e04a9f05.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_68d9247631b14f03aaba45557da5c304.pdf?index=trueIn 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_off0001f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F060 5188 bytes
SHA-256: 5ac66fa5cd46725532e27114f9dd04cb80550bcc4f9be3ee5097ed673eb38f36
font_01_sfnt_off0002021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2021B 11804 bytes
SHA-256: 66ac14eb43ba4067c8649faad0294ee9ca073230dd1652f45c79a67a37dc44cc

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