Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f3ec0d78dcd8c…

MALICIOUS

PDF

66.8 KB Created: 2020-12-24 22:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cb3263d7e0f31897850c184f23f225c9 SHA-1: d2dba64dc6c66857ec9ba4f267eb61779f1105f6 SHA-256: b50f3ec0d78dcd8cc95619466485b0970142bf63788be83ef64ac34c71a461b5
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure to disguise the malicious intent.

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://trafffi.ru/aws?utm_term=making+inference+worksheets+for+grade+3 PDF link annotation
    • https://cdn.sqhk.co/zirimikuj/7if5eie/screen_recorder_windows_10_without_game_bar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fc5121c642a0.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/bicDeid/dinosaur_attack_city_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f944e41451a4.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/SEZQonT/nintendo_switch_story_of_a_gladiator_review.pdfIn PDF document text
    • https://cdn.sqhk.co/naxopesareg/gjggjmn/5931145459.pdfIn PDF document text
    • https://cdn.sqhk.co/xurunesijud/hijc9id/48079114850.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/ijgUHhe/76035637207.pdfIn PDF document text
    • https://cdn.sqhk.co/lokileresab/jjjdtha/disneyland_hotel_paris_breakfast_price.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/GggjiVn/joweledinepek.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/jdihrgj/carriage_kia_in_gainesville.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/RNCq9P7/durapebaledirojiwojojogel.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/7f585e17-6342-4249-81da-bbf451432ae6/vugavigepanasosilaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0788aea4-d6f7-48ee-b8a0-d25f5fb4611d/ladder_unit_next.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2e72dc-65a9-4bfb-a397-60e97e220b9e/the_crucible_themes.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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 5576 bytes
SHA-256: 2d47241a49f954df8595da9af4724c418e511c9dcf0374b4c6543b9f53988161
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10180 bytes
SHA-256: a39e02c212d435b75b45983e02aea073324cf7d202d91f380c6dd81bd3f42300

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