Malicious PDF — malware analysis report

Static analysis result for SHA-256 470a3970f62f0ceb…

MALICIOUS

PDF

72.4 KB Created: 2021-03-03 06:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 753ab759c1cee0ffe6edcd879b5c872b SHA-1: 5bf4cde40975185ff051fa95d628c196c23bae4c SHA-256: 470a3970f62f0ceb5e2ce416fc9c01a66672bfec000c11adfbd5e88dc24acb70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination and potentially distribute malware or conduct phishing attacks.

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://xajibur.ru/wix?keyword=dsusd+school+calendar+2020-21 PDF link annotation
    • https://cdn.sqhk.co/noxawuge/8jfjeQ0/free_vpn_unlimited_proxy_download.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/c5hjct3/spin_the_wheel_gun_fortnite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_6023fd5fd3dc7.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/aAyvr8L/bujomaridemejitana.pdfIn PDF document text
    • http://itasummer.fun/the_travels_of_marco_polo_the_venetiansj9ai.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/Bgd1Vie/subway_surfers_princess_runner_download.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/60945372996.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ihihlig/paintball_mask_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/YsJnI0x/tiny_land_wooden_train_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_6018dc3917f57.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/pamakuguwamevalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_600ddca7dc1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602f70f972779.pdfIn PDF document text
    • http://bellissimo.online/foletugimawakeroky58f.pdfIn PDF document text
    • https://visumosibe.weebly.com/uploads/1/3/0/8/130814065/talore-garufa.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/jiUGLjj/disney_movies_anywhere_activate_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/backbeat_fit_3200_charging_case.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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 5384 bytes
SHA-256: 61263a7328f1c0df1bca33da18ecdbeb368b9aa52df127aef240c30152212374
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10380 bytes
SHA-256: 0ba8bb80b2adb0123125f1f249fa563eee3cea9ea6f232193c5eac7de7922655

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