Malicious PDF — malware analysis report

Static analysis result for SHA-256 d003d81f3e1fa266…

MALICIOUS

PDF

70.9 KB Created: 2021-05-20 13:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b9a588297728f9202a7a147bf2a9eaba SHA-1: 51eecccc97cc67594e4303a6df0d76310370fd83 SHA-256: d003d81f3e1fa266a4afe72c83f2ca41c5c1aecc5f266211e166f803685322a7
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests an attempt to appear as educational material to trick the user into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=prefix+and+suffix+worksheets+for+grade+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445880/normal_600f3154306f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_6018bbe04ec9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_6010b0da17958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_5fe8390f23e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_6035764978d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5ff5fe6ce1522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_605cd075bb339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89620556-e2eb-45ad-8649-aca6083826d3/battery_charger_for_pride_mobility_jazzy_select_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a0e0ac-9506-4dad-a45a-307e63b5bf9d/black_and_decker_scumbuster_s600_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dadb682-b36b-4a7b-aa1e-935e8523f60a/7475031805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ec1d21-6162-4c4e-85e7-0a36a8d07112/37992507989.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/86491760238.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/gexexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c259c6f6-f768-4621-89fc-3122eb97595f/rojugajofatavokiviva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c27495-b1b0-47ce-8871-7e543949cc6d/how_to_ignore_guy_friend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4601f70-f882-4ee1-bef5-359b9730b972/3608510672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ea63f3-5e45-4e48-8d07-47338f5f4c43/uscg_weight_standards_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35182e7-1b0d-45cf-b9b9-01ec70dd223b/original_broadway_cast_recording_-_les_miserables_1987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7156c400-b6cc-484e-bab2-c8c0361b4d07/36359097562.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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 5556 bytes
SHA-256: 280bc280b2158a5d20f1fbc16e58f2229cd11d82c704d666ea6cbab2f2df7345
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10208 bytes
SHA-256: 84ce5faeaf255689a69977ff94a76b61ab859ca53ae4123d4de153fe10f02b6d

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