Malicious PDF — malware analysis report

Static analysis result for SHA-256 13664d3f89bb57e5…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 22:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a612900c5aaa857b0a5aeb3906bd6997 SHA-1: e8ff92c0fe5622dfc51d4d1be2b0215b3a9c1231 SHA-256: 13664d3f89bb57e58d29a2bde06028ebe3003ee96703b1f54b433aee8f17e8a6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that leads to a URL designed to trick the user into downloading a file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF_URI heuristic suggests the document is designed to redirect the user to a malicious URL, which is a common tactic for phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/award?keyword=metabolismo+del+etanol+bioquimica+pdf
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/8343554.pdf
    • http://peteferix.mypressonline.com/classical_guitar_arpeggio_exercises.pdf
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/setawidibuw.pdf
    • http://rolopigabetitu.scienceontheweb.net/bozesunoveliravux.pdf
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/3465708.pdf
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601dbf9d7e393.pdf
    • https://cdn-cms.f-static.net/uploads/4463532/normal_60333b0ee6b5a.pdf
    • http://zesenadozefut.sportsontheweb.net/universal_remote_chunghop_rm-101_codes.pdf
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/681b8a091b.pdf
    • https://cdn-cms.f-static.net/uploads/4383577/normal_605681b0b947b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bigamutalunu.atwebpages.com/joindre_deux_online.pdf
    • https://s3.amazonaws.com/wusone/ember_spirit_guide_2019.pdf
    • https://s3.amazonaws.com/pozokimepe/interview_questions_and_answers_for_engineering_manager.pdf
    • https://uploads.strikinglycdn.com/files/a155cfd8-854e-441c-9ca7-c4a740c63f25/98775997593.pdf
    • https://s3.amazonaws.com/jamuluvuvava/2012_hyundai_sonata_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/5f6ba134-bba7-4ac0-abe5-12d0e87699fa/66878186689.pdf
    • https://uploads.strikinglycdn.com/files/dbfb4f9b-d6b4-4a52-a667-d97a1957fee0/ejemplo_de_memorandum_de_entendimiento_en_auditoria.pdf
    • https://uploads.strikinglycdn.com/files/113408a1-7c1d-4975-abeb-e02f7052bae0/suwipolelekura.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/36864623022.pdf
    • https://uploads.strikinglycdn.com/files/f9c61180-bdee-4dc5-a766-e3d3f1495317/allison_1000_transmission_rebuild_manual.pdf
    • https://uploads.strikinglycdn.com/files/51c81493-6506-4e7a-9767-b2cab0c22165/how_to_draw_a_easy_cartoon_computer.pdf
    • https://s3.amazonaws.com/dotivaf/54962368023.pdf
    • https://uploads.strikinglycdn.com/files/00f68828-7e40-4c86-9082-90cf3ce0e2d0/do_one_touch_ultra_test_strips_expire.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_off0000f5b8.bin
d39bc5f871cee190403795b75d9b8ce97ad40263b3ff1b5962c284cf2bfe2915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 5476 bytes
font_01_sfnt_off0001084c.bin
0e94394fd5114a11b6caf497b741093fb2cf9b09194b147ffd143f4d8fbb822d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 12420 bytes

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