Malicious PDF — malware analysis report

Static analysis result for SHA-256 774dd1095b050de8…

MALICIOUS

PDF

67.9 KB Created: 2021-02-05 17:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3f3968cbaea87e97174f4ec8789aade8 SHA-1: 0525973a98adcbeb98b8bcccf0a1471f7c2491d7 SHA-256: 774dd1095b050de8de314870c034618895ee2e229593cc0ed7445bdb32ab31bd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the document's structure indicate an attempt to redirect users to potentially harmful websites.

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://jottigo.ru/aws?utm_term=copayment+for+seniors+guide PDF link annotation
    • https://cdn.sqhk.co/sigidezok/cejdN3v/narogubazop.pdfIn PDF document text
    • http://scarcebook.com/knock_balls_apk_download4hzr5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fd39d6e70ec0.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/ShccTgj/barbie_fashion_fun.pdfIn PDF document text
    • http://pitushok.fun/computer_science_an_interdisciplinary_approachb9fyk.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/SbRifO9/real_racing_3_pc_size.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jdnjhji/best_3_point_shooter_in_the_nba.pdfIn PDF document text
    • http://zdorovienashevse.xyz/telecharger_music_gratuitement_mp33gugk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fd8292685f0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fc8d576e499c.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/vidoliwitig_lexaravukanuk_zumobejuxakiru.pdfIn PDF document text
    • http://podjem2.club/805353054468n2v5.pdfIn PDF document text
    • http://fibakigefejep.66ghz.com/curriculum_definition_in_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibibexubedumu.rf.gd/19687007236.pdfIn PDF document text
    • http://dupumimegijema.epizy.com/15814080910.pdfIn PDF document text
    • http://sasoregasot.epizy.com/ios_camera_raw_format.pdfIn PDF document text
    • http://govatojajij.epizy.com/arizona_wildcats_football_uniforms_2018.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_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 5336 bytes
SHA-256: 903024f3268deea7874fcc48eef0d7ae7015afa5b8f4681006b9786d7331bb34
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10452 bytes
SHA-256: 6379a2296d7df068930f682af206e97cff13626811d8d280832da18d3e7ac008

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