Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33cd7ec64404246…

MALICIOUS

PDF

74.8 KB Created: 2021-04-09 02:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16962a3547b58a674325c5f9c133623b SHA-1: d532812a19520865f0471b4118983d236e5dcc07 SHA-256: c33cd7ec6440424655b5c2359eeccbe0e6c381113140eb5beef9b5e16ffd3d52
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it is an advance-fee scam lure. The document body, though heavily obfuscated, contains text related to interest groups and references the wkhtmltopdf tool, suggesting it was generated programmatically. The primary IOC is a URL that likely leads to a malicious payload or phishing page.

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
  • 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://ponafet.ru/strik?utm_term=what+do+you+mean+by+interest+group
    • http://loxotuxer.22web.org/59420332764.pdf
    • http://nakijeku.mygamesonline.org/drenagem_linftica_manual.pdf
    • http://luzomatuv.iblogger.org/are_craftsman_table_saws_any_good.pdf
    • http://dunotebuxa.22web.org/44943087648.pdf
    • https://cdn-cms.f-static.net/uploads/4474989/normal_605bb58f3ec94.pdf
    • https://cdn-cms.f-static.net/uploads/4402503/normal_6056bdfab9493.pdf
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fe347247b3ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fda3e05-280e-4ae8-837d-ca0d6da46754/60777837312.pdf
    • https://uploads.strikinglycdn.com/files/a5672b4e-4171-4c52-a191-122fc887f380/bifinuzuninuzonuva.pdf
    • http://nakepusigazu.epizy.com/oncology_drugs_classification.pdf
    • http://tulifal.onlinewebshop.net/telecharger_catalogue_schneider_electric_2020.pdf
    • http://nozekosinigare.rf.gd/mejonipubimugupejasabakom.pdf
    • https://uploads.strikinglycdn.com/files/d977fc28-d317-4590-8dd8-6aff263f3ef6/what_are_the_example_of_food_borne_illnesses.pdf
    • https://uploads.strikinglycdn.com/files/1582d977-d1a3-482e-8660-37bffbccd5e4/simamoxinamolosadijunem.pdf
    • https://uploads.strikinglycdn.com/files/f1f935ac-7e65-421c-b8b6-4dba1121203d/kawasaki_fh580v_fuel_filter.pdf
    • https://uploads.strikinglycdn.com/files/5fc5601c-7cfc-497f-86c7-39321e543b92/60918229846.pdf
    • http://dofenepebasep.epizy.com/nuweloxo.pdf
    • https://uploads.strikinglycdn.com/files/037b015d-cc93-4557-8a44-19fb11430419/tufiliguwamajulomaj.pdf
    • https://uploads.strikinglycdn.com/files/8c95dfc2-4306-4ba3-9de8-c00e1001a4ef/24354613275.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_off0000e590.bin
e0f1d58a9b4e00ac902725f67fabcb76f23b7f06ac4f4e8b89da7657602b6bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5596 bytes
font_01_sfnt_off0000f879.bin
41e9e2619a384e01f11f75d2baf882c5ae92b315f5d81f16e9af74742b95e283		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 11248 bytes

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