Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4b4df9c4bd79e1…

MALICIOUS

PDF

80.2 KB Created: 2021-05-21 18:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b98a8c88552f46115c4293a7bb54a665 SHA-1: e7752a9614d63b3e4028df5586dd4ce7be449076 SHA-256: be4b4df9c4bd79e1f1ed919990119a158389011ebbdab2a8c16171fcc1516138
164 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, many of which are to benign-looking documents, but one URL, 'https://jottigo.ru/strik?utm_term=zones+of+regulation+thermometer', is flagged as unknown and is likely part of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, suggesting the document is designed to trick users into downloading further malware or visiting malicious sites. The presence of a download button lure reinforces this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=zones+of+regulation+thermometer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5ff46210acd17.pdfIn PDF document text
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/c748ea79b.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/narokofagidojugid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_60396ac142b06.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/1b4a78bd06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_605bfa0f45ddd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5feb44dee3e29.pdfIn PDF document text
    • https://donezuzigomage.weebly.com/uploads/1/3/1/4/131438278/fudimijuruma-tisib-papirive-nilujiwavew.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/593f62a5d98f.pdfIn PDF document text
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/5605504.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/52f38e23bbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/my_grammar_lab_answer_key_b1_b2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca45e500-f59e-4584-b09e-99804875cfec/how_to_use_fagor_rapid_express_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/buwemeforusexozuzuvewiniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22eb934c-4a7b-43de-8895-0d4f6762cedf/hp_6500_drivers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/how_to_cook_frozen_chicken_nuggets_in_a_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/givenulabanikobilogofu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/free_invitation_card_making_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/do_all_kitchenaid_mixer_bowls_fit.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/rules_of_attraction_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0e18b1-0b4b-4c19-ae1f-20999d395d5a/29718886060.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/classic_wow_enhancement_shaman_gear_guide.pdfIn 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_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 5140 bytes
SHA-256: 56cfe951d757ab23eb1b4872685627027caedbefd2d4e719dd31cb5e4a72932d
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10648 bytes
SHA-256: 88809f4ca1673fa194d2957e6074e693b69baf6d892f11138c54b10a4e537b3d

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