Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef433ae6c8c2181…

MALICIOUS

PDF

84.3 KB Created: 2021-05-18 08:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98640e211d7db2879a78353070d729db SHA-1: bfb906cdfeebef35986f60f8533ca059aeb14999 SHA-256: 8ef433ae6c8c2181284cbd03dddf029a9039dd0bee9e408504c6d48e039af847
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it uses an advance-fee scam lure. The embedded URL points to a domain associated with phishing and malware distribution, suggesting the document is designed to trick users into fraudulent transactions. The PDF structure and content, though partially obfuscated, align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jumiwimov.ru/strik?utm_term=toefl+writing+topics+and+model+essays+pdf
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fd1fd5a10857.pdf
    • http://ninavadilu.22web.org/44436048570.pdf
    • https://cdn-cms.f-static.net/uploads/4407084/normal_604a400998c16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gejebegujisutil.rf.gd/95056126991.pdf
    • http://vogenalosi.epizy.com/donobez.pdf
    • http://jidabaseruf.epizy.com/sewogazijorefuwatapep.pdf
    • https://uploads.strikinglycdn.com/files/924edbc0-a6da-4c70-92b1-95b3a2b29f38/the_elephant_man_tim_vicary_book_review.pdf
    • https://uploads.strikinglycdn.com/files/5bf692a7-a216-492e-8b61-2ae9fe0cfea0/how_long_is_the_mortal_instruments_movie.pdf
    • http://bogasupi.rf.gd/xukapukoxixosagawi.pdf
    • https://uploads.strikinglycdn.com/files/6ada4aff-c133-466e-a373-400eb71be8e8/ipad_mini_4_cases_best_buy.pdf
    • https://uploads.strikinglycdn.com/files/06cd6749-3636-4aab-98e4-8cb00bd8afe9/vomiredizularu.pdf
    • https://uploads.strikinglycdn.com/files/bf4e420b-b4e3-4ee9-a10f-8a49c1445370/lenovo_y50_ram_upgrade_16gb.pdf
    • https://uploads.strikinglycdn.com/files/52d7179f-3e0f-42d4-b83c-809a8fb2cbe4/zunakelesewe.pdf
    • http://puzuzebud.epizy.com/10262154489.pdf
    • http://tibelobal.epizy.com/44236112996.pdf
    • https://uploads.strikinglycdn.com/files/d1898b16-c6ed-4c39-9642-3cb20a688ca7/how_to_do_cbt_therapy.pdf
    • http://nunusama.rf.gd/physics_wave_calculations_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/c7d8cd30-a04d-44fc-9001-f8c5e71afe15/nuvadezesikirakulaxamipiw.pdf
    • https://uploads.strikinglycdn.com/files/0c3d493b-e229-407c-ac5a-fd736825ddc0/how_to_smoke_using_char-griller_with_side_fire_box.pdf
    • https://uploads.strikinglycdn.com/files/e488eac6-e23e-4553-ba5e-4ad459e80b85/football_manager_2016_data_editor.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_off00010b32.bin
ef4749535e90b1adeaf861167a8d5e00e12531d20495b74c1ac34b0fcedfee29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 5620 bytes
font_01_sfnt_off00011e5c.bin
e83905bdd7a7935d43b1b462f20d16a749d32f0c285765f8810711a31a1e55e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 11040 bytes

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