Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3ef1ac9e029402…

MALICIOUS

PDF

75.4 KB Created: 2021-05-21 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1225d6e5b351f91182c04fbf1cecf6e0 SHA-1: 4200120c86a51f136b5fe582312f8293fa32e484 SHA-256: 2b3ef1ac9e02940276fdab4bde5f71be240417b108f2a02f406222c4762f9573
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 phishing or trojan threat. It contains an embedded URI pointing to a URL that appears to be related to software serial numbers, suggesting a lure for downloading potentially unwanted or malicious software. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=serial+number+para+sound+forge+pro+10.0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450158/normal_6019cdb5448a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_602ad3a67a283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_604dc73915275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_6069794be7268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6032562de092c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9253adf2-6395-4dae-b1b7-5d46326dbaaa/93216692342.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/net_framework_2._0._5072_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/zawizanojegobomomolataza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38336525-2b6b-48d2-95cf-0d61193af23f/what_to_cook_chicken_thighs_at_in_air_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/free_manager_chrome_add_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044e1aa3-030e-4875-80bf-419f909b383b/xekogepun.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/hp_laserjet_3050_pcl5_printer_driver_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060e71d6-42da-46dc-8e72-1a3f8390bdd1/surface_area_and_volume_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/toyota_camry_2019_engine_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f53f29-61ab-47c4-9509-5cf5e09aac74/poulan_1800_chainsaw_chain.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/beechcraft_c23_sundowner_180_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/45559561518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d611414-b188-464b-81ac-67ea0b5f008a/how_to_play_descent_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/what_are_some_of_the_most_popular_film_genres.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 5828 bytes
SHA-256: bed1064dc26300ef1d2f1ee76b493a7e8707217678083ed9b57043bef5009e61
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10332 bytes
SHA-256: 3acbee9db78714d338928a8ce48d6729ecc3c5a84796d4039c4eb33627773fb0

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