Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ccf8b893398ae8…

MALICIOUS

PDF

173.5 KB Created: 2021-03-20 04:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28af18d39c54ac1788a2eaf2facfd6e SHA-1: b4a8f3089c06088d8f3abaefcd722fb173d48c1f SHA-256: 20ccf8b893398ae8869649bec367477683a34e4337c45b362c8292f76c3e6c0a
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no executable scripts were extracted, the presence of an external URI suggests a potential download or redirection mechanism. The document's content, though heavily obfuscated, appears to be a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=algebra+1+chapter+5+worksheet+answers
    • https://cdn.sqhk.co/zaweniwefi/YlbRieA/41885093868.pdf
    • https://pojazamajalo.weebly.com/uploads/1/3/4/7/134728500/malibeguziguj-zixofixowiz.pdf
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/vagurimi_ninirubo.pdf
    • https://cdn.sqhk.co/nawafoxobok/d0hjijY/10475821954.pdf
    • https://cdn.sqhk.co/rarukaboz/behhgeg/download_file_manager_for_iphone_4.pdf
    • http://zogometemo.sportsontheweb.net/76528496929.pdf
    • https://cdn.sqhk.co/tononapiwaso/jcPPPUj/ponabedededadenaloz.pdf
    • https://cdn.sqhk.co/bivuwusim/hb49ahe/18362437865.pdf
    • http://juvugewit.iblogger.org/avancemos_textbook.pdf
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/9435522.pdf
    • http://doguvubewolo.iblogger.org/ionic_4_starter_templates.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xasoxutek.epizy.com/diccionario_biblico_adventista.pdf
    • https://uploads.strikinglycdn.com/files/dd930c7c-0afc-4d1b-8f2a-ae91ea10c721/marco_fireplace_blower_fan.pdf
    • http://marurutefa.atwebpages.com/reading_comprehension_test_pre_intermediate.pdf
    • http://benamow.myartsonline.com/practice_sat_math_questions.pdf
    • https://uploads.strikinglycdn.com/files/6365bc64-71aa-41ca-ac03-2439e8acfb58/7164754892.pdf
    • https://uploads.strikinglycdn.com/files/e81f0198-8463-4c12-9482-06a8143455d5/niduvelig.pdf
    • https://uploads.strikinglycdn.com/files/3550d9f9-4684-4cf6-900b-78c8d5b05f37/dramatic_irony_in_romeo_and_juliet_act_1_scene_2.pdf
    • https://uploads.strikinglycdn.com/files/c999a972-0d81-42ce-b4f2-3b77352183f6/12210315132.pdf
    • https://uploads.strikinglycdn.com/files/7691ef74-6bac-4845-bedd-6a0031db1fa5/naming_ionic_and_molecular_compounds_worksheet_with_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002569a.bin
cf9058f13ee7c3c92e0d192ad40a5edcbdef2b5d94e7b7356c31d76c221dedb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2569A 5656 bytes
font_01_sfnt_off000269ea.bin
24db59903a2f7424f06bcd86ee76f757f4e339d15954a1619efe9aef7b64b534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x269EA 12056 bytes
font_02_sfnt_off000292cd.bin
482b7b4fee51162e6a5d82ff10b0db2f6da6482a74a1be5a66137bb6d850bf40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x292CD 16088 bytes

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