Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eee59d409c7896…

MALICIOUS

PDF

72.1 KB Created: 2021-03-30 03:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1541a6c84c92be7ae7aaeaa503609997 SHA-1: 58191a6650049e86e52acf221d791e7061bd835a SHA-256: 40eee59d409c7896fa4f5b2fbf2a762a10924355b9ff613a303cbe0ccbd191d1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9472

Heuristics 5

  • 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
  • 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://resalured.ru/award?keyword=hybridization+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/wodaximewule/lWxibfa/free_wifi_hotspot_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/eicgehg/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_602984ab61303.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/8820548.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/water_pollution_in_malayalam_language.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/hc2ugcT/gemukada.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/jFKicLD/dosinanelunivefi.pdfIn PDF document text
    • http://thecabinets.xyz/xodurmyq3q.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/cDqgj4c/48666936370.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/1386323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_603dfb0b50c64.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/iE8nt76/bollywood_party_songs_2019_mp3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zumovinej/jjhNPhi/kosenogokurazutimilir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5fe7909925e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/ADB2jdJ/ghost_rider_cardboard_bike.pdfIn PDF document text
    • http://ideaita.fun/how_to_become_a_medical_service_corps_officer1a4up.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/66a42eb4069.pdfIn PDF document text
    • http://opencabinets.xyz/what_are_the_10_most_common_fears_society_hassaou8.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hdgicjb/video_monitor_with_hdmi_input.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_602898148e173.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/jihlR5Y/deadfire_fury_multiclass.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/kemojisijonorisekovo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 5508 bytes
SHA-256: 8d527ba6c43fc27be361c64ee60b94db2ec6ad394e595e789c30325f758ec2c1

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