Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a93695bd3fdb788…

MALICIOUS

PDF

94.1 KB Created: 2021-05-13 06:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 52518734559925a3282d538838a05c4c SHA-1: 929e649587e58214e0ce82ed84c0a9f7964ecbe4 SHA-256: 0a93695bd3fdb78827537e7b52c60badf0ac3dd5fbc789a182e4d130f442fbb9
284 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting, suggesting a link farm designed to distribute malware or phishing content. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates that the document may also attempt to trick users into installing remote support tools, which is a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://yafferge.ru/strik?utm_term=how+to+use+a+crane+cool+mist+humidifier In PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/eJhcgfT/59220497343.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hgEkLic/cartoon_craft_mod_apk_android_1.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/uses_of_modal_auxiliary_verbs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_6048cf696eaa9.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/Tleiggc/biguga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5ff5aa91cf77e.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jdwHiaT/monster_hunter_world_fighting_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/fhdjcaW/extreme_bike_driving_3d_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/ihCihV5/fonuzabupoxegifabetebarom.pdfIn PDF document text
    • http://wibedepotemuru.22web.org/sunolarivizegakufowegani.pdfIn PDF document text
    • https://cdn.sqhk.co/pafitevet/gigghdi/interpretacion_del_electrocardiograma_normal.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/SggMfia/57996502264.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/h2XPigg/teamviewer_quicksupport_download_for_android.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/judedilenuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozudil.onlinewebshop.net/12315815692.pdfIn PDF document text
    • http://dilopopizepirem.epizy.com/gun_island_amitav_ghosh_free_download.pdfIn PDF document text
    • http://zijapipote.rf.gd/android_google_photos_backup_and_sync.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_25d1015053154704bd0a590f51d63e4f.pdf?index=trueIn PDF document text
    • http://feduneve.rf.gd/auto_repair_contract.pdfIn PDF document text
    • http://vuvodulewuxewe.epizy.com/velankanni_church_information_in_kannada.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_7f78412ca2134a16990ed25a775b9e20.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_846964af7d21494eb96fa80845c62100.pdf?index=trueIn 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_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 5316 bytes
SHA-256: e03ab1575d1f44ae14700bee32ce63e044324d514a56fe92c9db0b852ba2b4a0
font_01_sfnt_off00014648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14648 10832 bytes
SHA-256: 9bf651e411a988ddd99767787d93061785df37b86d6d10115cc723bbf91c6e00

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