Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0da184ca04ef7d…

MALICIOUS

PDF

62.5 KB Created: 2020-12-21 18:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bedbd8c80b2e05e02d03aad4b405e1f7 SHA-1: aa8f75d57f809e933b6df6779cb98df7a9befd08 SHA-256: eb0da184ca04ef7d6242dc4e5d7a95872dbe07b7fb5c95a370ec39050d0b4c3d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://traffset.ru/123?utm_term=rust+legacy+servers', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=rust+legacy+servers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412415/normal_5f9b6af218153.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/9795821.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/fdf80e3d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8743544fced.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/filozavovuwefi.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/e0ddaed.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/4d2b0065-774c-4205-8523-ec9c7a7dc08a/wititekeliganewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d1421a-f495-468b-ad41-78f56321e40b/speed_velocity_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd45865-b4a3-4b72-b7c0-bf299f5671b7/xixodufisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabbf1d4-c840-495d-89df-7377896fe5f2/polaroid_is048_camera_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4bf712-1941-4443-9278-d7063ee7aaaa/hacks_for_my_singing_monsters_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a1946f-3f5f-43dd-aafc-bddf8f2df77d/Grad_in_der_Fupflege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60169cde-6469-4095-b7c3-5c731d0c8921/82713226713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6995d694-e7ee-48e8-a410-1946590fb2c2/98333428533.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_off0000abc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC5 4756 bytes
SHA-256: 0ad019a04bbabc783b9db8c6da834fa13ac2439848f29ad61a8d4dcede838390
font_01_sfnt_off0000bc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 10880 bytes
SHA-256: 9e62af9fad9d9f3d65fa045037b239654937c34dad0abcd8cdc3082c77fa9441
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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