Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5da2fa56d48cfba…

MALICIOUS

PDF

81.1 KB Created: 2021-05-18 08:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57c0ce10c799ac0bfdda96c64d966eac SHA-1: 51a1fafb254b8d31f7036ce2c7903f76cabd2ee9 SHA-256: c5da2fa56d48cfbab767e3a9546d302903d8e5af846561f3e4be3526e9323a37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for SEO poisoning or phishing campaigns. The primary malicious URL identified is vilenefex.ru, which is likely used to host a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+does+flush+out+detox+champ+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447874/normal_606b88871e563.pdfIn PDF document text
    • http://faporivifavavep.22web.org/bradford_council_tax_benefit_form.pdfIn PDF document text
    • http://nigasutoxik.22web.org/national_5_english_sentence_structure_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_60258eb7e98e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_6031637a73c3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7858a1ad-5115-4e3d-a381-f1f658bc36bc/risetofugenizu.pdfIn PDF document text
    • http://mogowekuweda.epizy.com/asthma_ppt.pdfIn PDF document text
    • http://nalevozuwe.rf.gd/37966190085.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/35837530866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c6f6cd-1acf-4a7d-9788-196311679d45/vox_vt20_specs.pdfIn PDF document text
    • http://mevipimep.rf.gd/karl_marx_biography_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73dd26eb-8f08-4d17-aad3-9c20f813f5fb/92303114988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af46959-c881-4ec0-9827-3941e3ec2648/resumen_de_la_obra_la_ciudad_y_los_perros_corto.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/android_1_mod_apk_dead_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80a55d1-5c45-40b4-8814-3d09c34f5fdd/34431388982.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/19192528590.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/fujitoz.pdfIn PDF document text
    • http://luzawuwu.epizy.com/company_introduction_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc1a692-a03a-407c-95e9-1a5b0f070961/rupugapoxesototimuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c8822f-f15e-4c8e-980e-f52a518fea6c/swisher_mowers_dealers.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bedarifubonenaburuxan.pdfIn PDF document text
    • http://lezujepadu.rf.gd/what_accessories_do_i_need_for_a_cricut_maker.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_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 5580 bytes
SHA-256: 475e567a8f8e1803c5c0bceddca5ad07887032b1f7bce824d80f214abfa5a538
font_01_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 11040 bytes
SHA-256: 833a26276c59a84f50b3a3c243df5d33bee17afe86531ccc445a2a4384a33db4

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