Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfadda63f6431b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 08:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7a8c0d6910785e4a41ddbc2d8c18c0f2 SHA-1: 10a576efeacdd794a8a3fc3bdb2caad43b75b10e SHA-256: 4adfadda63f6431bab2388dd168516579b791bcabb13ea308425c158d1f20025
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, specifically by hosting a large number of external links designed to appear as legitimate documents. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick the user into downloading a password-protected archive, likely containing a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/award?keyword=anestesia+epidural+en+el+embarazo+pdf PDF link annotation
    • https://cdn.sqhk.co/wexunabem/AicgfcR/1256380892.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/concept_of_andragogy_in_education.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/hauFgu8/wemejija.pdfIn PDF document text
    • https://cdn.sqhk.co/xonumizeno/uYgjlih/bootstrap_gridview_template_replacement.pdfIn PDF document text
    • http://bewakidigi.22web.org/grasslin_gm40ave-r_timer_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/3wAhetW/debajokowigufirutelus.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/mMOn3ji/orange_and_grey_frog_tape_wall.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/hgeihZ2/roblox_support_forgot_password.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_052c95a07d3f4e9c80c7ebcaf55291d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fb4e67-a473-4f81-84a4-6648b492a51d/berasajarunoxiwozovazoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f91c17-1587-4e34-8422-e8bb5c74c704/can_you_renew_your_learners_permit_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604b5f7f-e4cd-4125-ac83-7ebd6b59f967/what_does_intimate_gel_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efe5d38-1534-404c-86aa-568b87f5ceef/microsoft_office_table_of_contents_tutorial.pdfIn PDF document text
    • http://vopapatadape.epizy.com/offline_action_games_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caad4c39-b6d1-4ac5-bdaa-16eb77b0374a/bizoja.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/how_to_descale_a_braun_tassimo_coffee_maker.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_b5a98e93a984454982320403d49fdae1.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_546614bc248a424781830d699f71918c.pdf?index=trueIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_fc20f0595395484d99656f0d243f62e7.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_d6ec2326cba24c6380a676748bca055c.pdf?index=trueIn PDF document text
    • http://dowafirowelumex.atwebpages.com/parmenides_arje.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5368 bytes
SHA-256: 37f678075590db2029a2238873ce68f8dfaad7680b261c9fca6f9d017ab17b06
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 12052 bytes
SHA-256: f04966d46b1606644d5c007c83a4dfd16a48656b7a3dfa98bcc129cea8d65d87

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