Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf39c4c3b11c970c…

MALICIOUS

PDF

73.7 KB Created: 2021-02-18 14:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04aa976d05ca1b3122ac950d4bdb3ad0 SHA-1: 8843d93a3857c03b63442bff8d825e1c6a1caca3 SHA-256: cf39c4c3b11c970c5d870b7ef310dfa80fc4c3e02ad7015d84585bf4991def93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/123?utm_term=can+you+trade+options+on+webull+paper+trading PDF link annotation
    • https://cdn.sqhk.co/toxodabatot/Hzjjiii/new_hard_rock_songs_2020.pdfIn PDF document text
    • http://cethq.xyz/63460816129wi9p2.pdfIn PDF document text
    • http://xenuven.22web.org/pradhan_mantri_awas_yojana_in_gujarati.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/XiU3bdR/jigerogu.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/VdhyMZk/tuning_club_online_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/didiajh/67295955584.pdfIn PDF document text
    • http://ens-pictures.ru/34284037273guxmq.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/edhf8je/7844912691.pdfIn PDF document text
    • http://mnatural.space/9108227385twjs7.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/hypertension_canada_guidelines_diagnosis.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/hehdGVE/bugifakalukog.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ejdXhjI/49171054780.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/kxKIsjj/724_area_code_north_america.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/navebur.pdfIn PDF document text
    • http://lopusewagini.epizy.com/punjabi_emotional_songs_pagalworld.pdfIn PDF document text
    • http://xifofemixogo.rf.gd/caller_id_changer_mod_apk_7._8.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/timex_expedition_watch_cell_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/vozumobozudide.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_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 5364 bytes
SHA-256: c5c098c4d465b6ea1bc703ab519194ebec2de68a8fc314f667086dfd042b1ad1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10228 bytes
SHA-256: e9f2d1048020b20eb617df260fa027d3b8f2735752b90c1e3c08e412edc22095

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