Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66f38c27554d02a…

MALICIOUS

PDF

83.9 KB Created: 2021-01-05 11:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e56173080a3170061671f26c74f9a11 SHA-1: c7db977691190c6fb36ae674099816a14f723299 SHA-256: c66f38c27554d02a9115e7b3885c588cf33c8e72e43482149f6c1bc92d65c8ce
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a "Skyrim quest checklist mod", suggesting a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=skyrim+quest+checklist+mod In PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/35967f688.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/LJgjifx/amaze_game_level_253.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vidabudivodeduwokobu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/wjdUjba/vuxunirovuxijoxexakokemo.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/4308268.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/16d3cb38-7cb6-4dbb-bb58-fa875a86a244/20476358589.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/78783959878.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/dayton_white_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/snacks_recipes_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4050b88f-8cb4-4220-99c9-22641b7744a9/morris_jumel_mansion_ghost.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/animales_en_ingles_con_pronunciacion.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/languidecer_significado_sinonimos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0c4f41-2d9d-4c0c-8dfa-3a446792dd51/pong_3d_bear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef2eb03-a478-4818-bf9f-67c742285d07/jagawizoremukovubetoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce81c865-dddf-4dac-a499-51b23872c55f/85455229439.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 5364 bytes
SHA-256: 9267b6ffd4d3e01228ae851e811d66a39ad35a40c518bf89f54f7374b239da6b
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 11980 bytes
SHA-256: 3f8676f9f4444fe9eeec3a457fd1bd6dcb1196ac82e0037e19daad03203a657f
font_02_sfnt_off00012d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D86 16164 bytes
SHA-256: 484b678c4201726d77520646f31387e773137623ee1bc4c811904568b67aa33e

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