Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f7ea87876ed221…

MALICIOUS

PDF

79.5 KB Created: 2021-04-16 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e55b7af8751104b67cfdc2f1ca63c09d SHA-1: d0a488ea2ec6495bc34d9eed965b7c193cbccff1 SHA-256: f8f7ea87876ed2218087ebec8bf2f68c5c7098cde523caab63df332f8bd7ede3
134 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, with one prominent link to 'jacksth.ru' disguised as a product listing for a Casio G-Shock watch. The document's structure and the presence of multiple disposable hosting links suggest a link farm designed to redirect users to malicious content.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=casio+g-shock+ga-110mb-1aer
    • http://bezigex.iblogger.org/krishna_bhagwan_bhajan_video.pdf
    • http://smartcreditcheck.info/navien_tankless_water_heater_manualr67h6.pdf
    • http://letgtma.bid/wekibomigaliwb4dq.pdf
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/9edcc5e24e08603.pdf
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/3023023.pdf
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5ff37006f33bd.pdf
    • http://uanews.website/convert_to_word_online_using_ocr1m2un.pdf
    • https://static.s123-cdn-static.com/uploads/4418184/normal_600236cb4b489.pdf
    • https://sewizejego.weebly.com/uploads/1/3/4/6/134679492/gosufozikuriwu.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_605ce9d349dbc.pdf
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/votogutu_pubuvimokaz_rovuvono_kijokipixexox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_4c3b5f16e8ec427e9106bd7107134ec3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0e13fa5-7558-42a0-842c-b9709c77d4e2/gegizelo.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_ca50803045514ce99b1a739dea75fa47.pdf?index=true
    • http://zarevamemamafo.rf.gd/kijikusiwatas.pdf
    • http://fapibudu.epizy.com/apprendre__programmer_avec_python_3_eyrolles.pdf
    • https://uploads.strikinglycdn.com/files/e860b5c1-bb2f-4ad0-a922-7e7ddaff8c27/when_the_sun_shines_we_shine_together_karaoke.pdf
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_c23c4bc19b6945fd82f1873494567c04.pdf?index=true
    • http://rozipiliwune.epizy.com/dufawuguxinejodoz.pdf
    • https://9370005b-87d8-49d8-b27c-18dce193a2f1.filesusr.com/ugd/52ea04_1ee507c3efa14d74a63abe428401d755.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5e.bin
a146f09ef23bb1cbc06812a63cd84aa69670f7a6241d3b71ec2f01398574fcfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 5516 bytes
font_01_sfnt_off0000fcf0.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 1800 bytes
font_02_sfnt_off0001057e.bin
ce5df69d3ebd6d919e0d89ed319e6d41e714e0cf6aca22d417b6abbedf3976c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 12192 bytes

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