Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c83d385a2d3111…

MALICIOUS

PDF

68.9 KB Created: 2021-03-17 20:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f0495f866321f931ded70dce5b60f9f SHA-1: b50dd5ef43c8245a1d8a60b17d8a17e1ba6c765d SHA-256: 57c83d385a2d311124df3471e1eeac42b4b7c6a1462783e3096b82d61c682201
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a probable attempt to redirect users to malicious websites. The document body, though heavily obfuscated, suggests a lure related to 'minecraft fnaf voodoo doll' and includes metadata from wkhtmltopdf, hinting at its generation method.

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
  • 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://kuzutuzo.ru/wix?keyword=minecraft+fnaf+voodoo+doll PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5fe0d6d233850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_5fd8e70e11d07.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/12a_cartridge_refilling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fc8107a43265.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pojinuburijaxirawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_603ea64274f6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/Chjgdje/mawejivitadin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449990/normal_602b39016134b.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/used_line_6_spider_iv_15w_1x8_guitar_combo_amp.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/basketball_plays_for_middle_school_against_zone.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/hJp0VmT/word_online_download_free_2007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_60339a1b6c8f1.pdfIn PDF document text
    • http://dakixofib.22web.org/65463219000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_602ba0411dda7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikisefux.epizy.com/54045110692.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/3d_exporter_for_autodesk_inventor.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/amphitruo_plauto.pdfIn PDF document text
    • http://kabitivawenavox.rf.gd/gilivexijebiterijudeje.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 4900 bytes
SHA-256: b1e539bd30e3e820674310ff321041a59f415e30258e28cf29b5d969a07e3b3c
font_01_sfnt_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 9836 bytes
SHA-256: 33bdb779a27770c4698c709669b815dda20fcd04564dae2e08cf4b6b9efedcb5

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