Malicious PDF — malware analysis report

Static analysis result for SHA-256 74de15cca206d8ec…

MALICIOUS

PDF

85.0 KB Created: 2021-05-22 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d099616be415c44c14572fc2be074603 SHA-1: 79da11308a9dd32148309e099f4affb3f0ac1da4 SHA-256: 74de15cca206d8ec68bedcf00d20efb8e7956b11b19669cc76882e87a79bba15
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no direct executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=que+significa+el+camino+en+el+mito+de+la+caverna PDF link annotation
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/2a8dc.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/8017997.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/suwonirufi_lekuvegut.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/b17754dc.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/6a2f9c8c4a.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/4171085.pdfIn PDF document text
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/a4758ab.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/jojadufiduxufaw.pdfIn PDF document text
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/2438990.pdfIn PDF document text
    • https://dowanolisedu.weebly.com/uploads/1/3/6/0/136056386/2399406.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/20e75e3f765aae.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/ab6c8a.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/214274.pdfIn PDF document text
    • https://pedekibitu.weebly.com/uploads/1/3/4/6/134669881/jonixonizuse-siwozimuvus.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/5798567.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/53757caa-16e8-4e77-b541-171fd7e73011/how_to_change_picture_background_color_in_paint_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d15ec2-16a0-45ec-aca9-072b8cbf3cb3/lexopalagoziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1b3d69-5dcd-4857-a567-ea2a50808293/singer_4423_vs_4432_vs_4452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7a67d4-e187-4a89-a8cd-fab7059617d2/spring_framework_java_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdda463b-608f-43e1-b6b2-d55ed5731469/misery_stephen_king_character_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbc58bb-766c-4dc6-997e-e7d78a29fe40/nezal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c629767-60ec-4921-ba70-95d213a268cf/how_much_is_nespresso_subscription.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 1604 bytes
SHA-256: 2865e7baf948dad665c6444796ca384115bd4b2b4fd1fe86d29b5d3d3d6405bf
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 5344 bytes
SHA-256: 53e00d44c46e2273a4660a5a8b51a65ffec15dbbcd79f563399683f4b1fa2300
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 12132 bytes
SHA-256: 9aa229c00b8f4240f8d9f2edd38ef80699c4eaf9584238255b6b1d29ebe55546
font_03_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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