Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbba5e4c99ad633d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-31 22:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82f4f0e491c0bade9bf7b48e2d05eac7 SHA-1: 7b43973d02b3e0971f9a126d8ad7d1bae375a8e1 SHA-256: cbba5e4c99ad633d26fb08e306cc62a7664883d3d1e2ace74cdd7220f7a11870
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to 'exercises pdf', directing users to a suspicious URL. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF detection suggest it may contain or lead to malicious content, potentially a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=irreale+konditionals%25C3%25A4tze+%25C3%25BCbungen+pdf
    • https://cdn.sqhk.co/zaniridut/fMK6hcT/37469585533.pdf
    • https://cdn-cms.f-static.net/uploads/4465024/normal_603e450b0dbbb.pdf
    • https://static.s123-cdn-static.com/uploads/4417413/normal_6004877d49fbf.pdf
    • http://wezejej.22web.org/2020_cadillac_sts_owners_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd38c7396d79.pdf
    • https://cdn.sqhk.co/pogadidotilu/mjehjii/16970167617.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fe62b9224220.pdf
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6061acca1cac3.pdf
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fcd9d0532dee.pdf
    • https://cdn.sqhk.co/temududote/bXjaJBV/storm_racing_drone.pdf
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fedb98fc7a8c.pdf
    • https://cdn.sqhk.co/xezafube/Rhehcib/99142906685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xapidajovaji/gukuvurilebukazulimibeker.pdf
    • http://nobegik.rf.gd/vosafobaguvok.pdf
    • https://s3.amazonaws.com/vinejivunitego/children_s_place_school_uniform_shirts.pdf
    • https://s3.amazonaws.com/tobojelusiwi/car_suspension_system_project_report.pdf
    • https://s3.amazonaws.com/fuwawibu/call_recording_app_2018_jio_phone.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/flight_pilot_simulator_apk_android_oyun_club.pdf
    • https://s3.amazonaws.com/benuka/chromebook_3380_manual.pdf
    • https://s3.amazonaws.com/remeranexe/first_day_of_work_outfit_reddit.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/jupapupojokosinafepole.pdf
    • https://s3.amazonaws.com/sagotomagin/how_to_convert_adobe_to_paint.pdf
    • https://s3.amazonaws.com/posaxugidut/curso_bls_y_acls.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da88.bin
162b44d456417cbb6452c455a162818a43d409d8b9c144d02f15982fad645655		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5756 bytes
font_01_sfnt_off0000ed62.bin
ad663b836d87099f9eb50ba79d048eddc1f6466b92ed1caf5ed216fbfffcea5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 11220 bytes

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