Malicious PDF — malware analysis report

Static analysis result for SHA-256 a077d159748cfbc4…

MALICIOUS

PDF

66.4 KB Created: 2021-04-03 23:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 995c6686d9b7ad47ae64b1437cea818c SHA-1: ee628302b14755905d96351318e76a05678929ff SHA-256: a077d159748cfbc43547d505a11c8f03376988aacdb3767c0d667a2bb3661cab
104 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The presence of an external URI pointing to 'jacksth.ru' suggests a download lure. Although no scripts were explicitly extracted, the PDF structure and ML detection strongly suggest an attempt to trick the user into downloading further malicious content.

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
  • 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://jacksth.ru/123?utm_term=apush+chapter+1+focus+questions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459165/normal_604e91a7b7eaa.pdfIn PDF document text
    • http://newsportstechnology.ru/aviary_photo_editor_frees42rr.pdfIn PDF document text
    • http://test123test.xyz/where_change_transmission_fluidj0651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374535/normal_5fdec3ab7f344.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/jdia6ji/truck_driving_games_ps3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fcf9281ec0d6.pdfIn PDF document text
    • http://shoop-fl.ru/button_battery_chartsfmdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_603e10c8dc731.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/zQRjhji/39583352987.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/fighgzk/rotutakusenaraxateximape.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/hB6hdjN/soap_wire_cutter_reviews.pdfIn PDF document text
    • http://enots.space/triangle_congruence_proof_worksheet51e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6017052900aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fe72f8c48989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5ff4a4544f16f.pdfIn PDF document text
    • http://zarabatyivat.ru/fluval_306_canister_filter_cleaningjmdvc.pdfIn PDF document text
    • http://thesalle.xyz/rogepuxowts8aj.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/samopakamefap/saxusivelogi.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/marketing_strategies_of_coca_cola_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/12688120836.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/15471351856.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/tai_game_hacker_apk_appvn.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_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 5332 bytes
SHA-256: c05a62dd507265282d45e5143597783f84d8d7a5585888d0c42511ff605154e5
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 9908 bytes
SHA-256: 2d928ae5a6e70d4d271de1d425614c4522e97009d0de575a382e42acd3eb4a9e

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