Malicious PDF — malware analysis report

Static analysis result for SHA-256 846771108ddc88fb…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 22:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a111fcb6280c4e2959c23fc877d1df51 SHA-1: 168622693e27fc391fb58ab813cc2cf8559b8cf1 SHA-256: 846771108ddc88fbaa4bf4d34a9095493a0322966d7d228f6e86dbd5ad854e8a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple disposable domains and link farm characteristics further supports a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://crophysi.ru/award?keyword=sony+usb+turntable+software In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_60341caba94ee.pdfIn PDF document text
    • http://hamsterbig.com/como_colocar_o_word_em_portugues02j7u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5fdf340f19e72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fcf3dae16191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_601d387130d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd646b99c43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_600dc4d565807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fd2a2207ad18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fd71b12ef6db.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/boburajanukexim.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/verivegedukanipelipituwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5ff803dc37910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojanesifilagu.myartsonline.com/xidulutifewasow.pdfIn PDF document text
    • http://wasalesex.epizy.com/mexagugopug.pdfIn PDF document text
    • http://palezonipegodaf.epizy.com/48318133608.pdfIn PDF document text
    • http://toxijojow.epizy.com/bhagwa_rang_song_pagalworld_video.pdfIn PDF document text
    • http://suvejozuwedur.epizy.com/xofad.pdfIn PDF document text
    • http://nolepukopele.epizy.com/ripelefapelenizodo.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/is_percy_jackson_in_the_lost_hero_book.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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 5200 bytes
SHA-256: 58fa54aff84d91e3817fa9ded6dc4e7c3817cac4e6644b070984d47aef2b0018
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10732 bytes
SHA-256: 4f479e7460d1a0212022de6c966b30c93d68b5722836639bcf244b2de4564f18

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