Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eff8a29a4751315…

MALICIOUS

PDF

88.0 KB Created: 2021-04-07 07:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f27033726cf8e77aa0e5556fb6ac3e SHA-1: 539113c8da21e254f09d46667034f47d1e8fd5de SHA-256: 1eff8a29a4751315491b203d09d30db3d56882e36e841c468745fed3e8ca70c2
116 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam. While no scripts were explicitly extracted, the presence of numerous external URLs, one of which is directly related to a search query for a manual, points towards a lure to engage the user. The PDF structure itself contains embedded URLs, further supporting the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/wix?keyword=avaya+etr-18d+manual
    • http://pupezawat.scienceontheweb.net/20670728997.pdf
    • https://cdn-cms.f-static.net/uploads/4483586/normal_60566ccf52ec4.pdf
    • http://bawimip.sportsontheweb.net/complicaciones_toracicas_del_absceso_hepatico_amebiano.pdf
    • http://uscarinsurance.info/sigunemodabugusipovubeul7v5.pdf
    • http://tertov.xyz/what_kind_of_bugs_does_arizona_have6lund.pdf
    • http://startbastar.online/63925882205i99qd.pdf
    • http://groby-ritual.online/dedurujurudinujetikubomtgf.pdf
    • http://tehnikator.ru/consumer_reports_on_best_refrigeratorsbeop9.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd644c96915d.pdf
    • http://cancandance.org/40986105202z0e8q.pdf
    • http://rubka.space/riz_cantonais_reunionnaisengr1b.pdf
    • http://cooldomen.space/18397572022oshyh.pdf
    • http://copyrightsupportforlnstagram.com/zoponimekaxesolonenulof7xbg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d113110-13c7-4d18-a7d6-8c42b1de925d/adding_and_subtracting_fractions_calculator_in_simplest_form.pdf
    • https://uploads.strikinglycdn.com/files/313968d6-03d7-48b5-9800-6d4461eebbe2/can_i_cancel_maxcare.pdf
    • https://uploads.strikinglycdn.com/files/2538f76b-adda-498e-80e5-4f5b1822a8b7/game_of_thrones_complete_book_series.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_off00011b72.bin
f11831341dd8ace5f169217cf95f58292aec2756aff5fd8dca582ed46c078b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 5224 bytes
font_01_sfnt_off00012d3b.bin
75f6b12fbe340404cafd1072cbed1dbbccbd07384e88cc166420ef264091e225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 11248 bytes

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