Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8391ac6816bc79a…

MALICIOUS

PDF

70.3 KB Created: 2021-02-02 09:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 604f838cc6379c28f8c5eb83de6c9639 SHA-1: 690d1c3765715f00eae32f0a46c9dc99fb61c8d2 SHA-256: e8391ac6816bc79abedf605091b7d3612f4b065835e045f9a7a464580e42950e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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.
  • 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://crophysi.ru/aws?utm_term=pressing+charges+false+police+report PDF link annotation
    • https://cdn.sqhk.co/letowajaf/cuhfigy/98795820764.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/enjj0Ha/dotovoginejuvufizamiweva.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/DYgjjjU/cold_war_call_of_duty_leak.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/suzegulikezamolakux.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/0813ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fdb102b39162.pdfIn PDF document text
    • http://mijuxub.66ghz.com/parquet_file_format_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6009be38bb986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_600ba5f0b325a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5febf8b792678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5fc6495189d77.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/f8nVM4d/splash_cars_mod_apk_unlimited_money.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/zugete.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/NrJNBgd/cupcake_jemma_recipes_vanilla_cupcake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufizup.rf.gd/free_hvac_preventive_maintenance_agreement_template.pdfIn PDF document text
    • http://kepikinol.epizy.com/bully_anniversary_edition_cheat_menu_android_apk.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/76055517252.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/woxatogufidaxodi.pdfIn PDF document text
    • http://repefewuvu.epizy.com/free_printable_reading_comprehension_worksheets_grade_7.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5276 bytes
SHA-256: 921c8422bf2eb0a0b920c8ce2ad62457d0cf6c0d8a4365908d5205eaaa5c5b78
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10096 bytes
SHA-256: ae534f4045626e64a428c3ed411dfbeed918bfdcfc018ea55cef88a2418d8862

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