Malicious PDF — malware analysis report

Static analysis result for SHA-256 266841dcd9570fab…

MALICIOUS

PDF

72.4 KB Created: 2021-03-28 08:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dee5dbc32f7e0cb1d536a06b1a951aec SHA-1: c63000ff153be50687137083c29d3fb71263a59f SHA-256: 266841dcd9570fab6fa8f47badd29a100d8c32d146008c30786f64e4cce29fbb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=jvc+lx-wx50+manual PDF link annotation
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/39e7a.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/4413099.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://kinokaiff.space/man_in_the_high_castle_season_2_ending_reddit3d2ya.pdfIn PDF document text
    • http://omerkatanalp.com/xenavedixijibavavilogugaebzj7.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/wowavoduf.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/08488fd1-2460-4c88-bde2-7a38e2084f1d/physical_science_p1_grade_10_november_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c03045c-a556-4554-ab57-277e9135406f/delta_foxtrot_tango_meaning.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_dad01c4cfd4741aab5cbd642a1429d78.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_3f60af9c9c9a417384295a725453f02f.pdf?index=trueIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_1073e059f3744b36a6585ac23f0f4d69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6341f31-7089-4929-b644-9913026906d1/toshiba_touchpad_driver_windows_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a3a28-221e-485a-8551-b62ae4a17a8e/pavel_tsatsouline_workout_routine.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/fishbone_diagram_template_excel_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/computer_networking_mcq_questions_and_answers_free_download.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ab37a25c9d90486fa8629f509a55ba47.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_6c730aed3b17405d81bdc0a0ef55dfe2.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fe64d0b9c00b47bc933b4a7616e93f13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/the_cause_of_moon_phases_worksheet_answers.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 2828 bytes
SHA-256: 2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553
font_01_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 5180 bytes
SHA-256: 2356e15ea6d336491114b1ce98fa5c16d2925296ba883cd943faf7ef9e3a9e0f
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 11600 bytes
SHA-256: 922cc9a0e3bf60a7af73678e5a1e2a5d8e84bc2ee7b953ed050eb58c83aa1924