Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86e49bd8f8e07e3…

MALICIOUS

PDF

68.5 KB Created: 2021-02-08 04:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d5a454bc497c7be16ee16e1159b0eec3 SHA-1: 9fb96560245ad2bb74e84b382820413f84074732 SHA-256: c86e49bd8f8e07e3acf0a19e851c51befa8b2cfb2b05a052fbc0c0a3c7f3f302
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDFs. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary purpose appears to be directing users to a large collection of SEO-optimized links, likely to distribute malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/123?utm_term=what+is+a+bootloader+unlock PDF link annotation
    • https://cdn.sqhk.co/xidupesijij/hihihNN/new_york_city_live_wallpaper_iphone.pdfIn PDF document text
    • http://itawegan.space/gaxemadofadepukw68g.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/hWEAhiu/pefaraxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_6011737c22d63.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/FjjEnhh/nukozexekip.pdfIn PDF document text
    • http://xsafak.com/bunny_carrots_food1g9js.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/puxowe_melitefixozep_zutujozaxidixol_muwalupifufirat.pdfIn PDF document text
    • http://instup.xyz/simple_balance_sheet_practice_problems_with_answersf9np4.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/INbfPge/zufosasobedufebizadaxem.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/gfgdcii/pedalizorivolere.pdfIn PDF document text
    • http://verifybadgehelp.com/dizafofazsanaq.pdfIn PDF document text
    • https://cdn.sqhk.co/semexixok/hbjfhhm/todulefumigifok.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/4jiFIgc/dunkirk_observer_obituaries.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/sidupijat.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/gobezogab-fukogezoposaber.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jzQbOif/7492861481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 5244 bytes
SHA-256: 0d2e5c1141bf3aa6ee80334ce182f11bf4302d7852fc542149ded47e674b635f
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 9400 bytes
SHA-256: 3faca44893e00ce4c3ef7af85225bad38b921c7a91a1cffb2879dbba984c5eb2

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