Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3252e7c8988d67…

MALICIOUS

PDF

75.5 KB Created: 2020-11-25 08:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6b8a6083dce8d0b5aee1e813e1cfbfec SHA-1: 99b86bfe99e9ef92f9cf8a560e22041f422b539d SHA-256: 6f3252e7c8988d671ec240bfcc93f6f07b00ec7c7c612c1263bce4af524f71fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'traffine.ru' and a filename suggesting it's an operating manual for an Apple MacBook Air. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=apple+macbook+air+operating+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f9b27357c2c5.pdfIn PDF document text
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/9956405.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/zodun_fufut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5fa0ae201c81e.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://s3.amazonaws.com/ribowexulo/last_day_on_earth_survival_hacked_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e74394f-0b2d-4aef-9639-a7c15b26adf8/72996177314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f487c230-5323-490f-afe4-72d2e01cad9d/88224065617.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/planning_a_workplace_health_fair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d584e650-513f-4d30-ac39-6e0a8479ac94/canton_middle_school_principal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecbfe92-6b1e-4b30-9023-8dee973ff519/cmo_para_eliminar_latidos_en_beatst.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/thinking_in_java_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/zesadotonuxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a78c6fa-2db5-4684-a22f-ec6925ce6d02/valoracion_neurologica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e793af-5335-4de9-a2f8-1189d8c668f4/dowaxekegukuselapileza.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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 5152 bytes
SHA-256: de0d3f5bf0af9d1fe3ed1e6ef60a9097471b7acb4de8139b7b90bc9400953010
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 11592 bytes
SHA-256: 255bbca535b7721ea8ee2a25973afb71a65bee9294300c67ed5eb0f3e30be1c4
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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