Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ffc31ff652fb5…

MALICIOUS

PDF

79.6 KB Created: 2021-05-24 10:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 41045471d06370b895310ccb43f6f25f SHA-1: ee8e42907dac7ca713fa4731ed4d7502551fd5a7 SHA-256: 136ffc31ff652fb5578544437ecf34005117b107ddb4e9ecb90d299cc1fd69e3
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an embedded URI pointing to a suspicious domain, and ClamAV detection confirms it as malicious. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, suggests a lure related to educational exercises, likely intended to trick the user into visiting the malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=exercicis+perifrasis+verbals+4t+eso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6029e2bda9bc3.pdfIn PDF document text
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/zepasuwas.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/f64d12e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ffae8db3ccee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60342788eab91.pdfIn PDF document text
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/ninotegob_zivozidolodazu_gijoluvopibaluz_rolov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5ff672cab70d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3f2d23c7-41fc-4181-8708-4d8ac92a6528/proving_trigonometric_identities_worksheet_with_answers_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/taotao_scooter_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415e18f3-5502-4e10-ba5a-47dd4932b37f/how_to_setup_hp_envy_4500_printer_to_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/android_phone_tracker_using_imei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f5e79b-fda6-4816-b87a-15498cfe7a5f/67425909987.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/aimbot_free_fire_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37fb53b-5ef5-4c26-847d-ca8e7ab13ed5/kenuvasumatet.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/brother_label_printer_ql-_570_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/descargar_pro_tools_11_full_espaol_crack_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/90468236498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81aae25d-2513-4efb-8d5d-08d75f454399/how_to_hook_up_a_sony_xplod_cd_player.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5004 bytes
SHA-256: 4f98da6228544bdafd9b64c10b9b84764c346d0480497d4563641e753e5ccd29
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 13108 bytes
SHA-256: 6519286922e32e7449405832bb873eef089bbd964a51bf6b48dae48d8bbe7466
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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