Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3caad3b42140aab…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 06:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e999429f1db7aa2d5763dd4284ca015 SHA-1: 8d173e29cab590c3c9ba209e8dce629758929b1d SHA-256: a3caad3b42140aab006e61c7f950bbd0234adf3e062a15ff400c484074bca4d2
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9992

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/123?utm_term=chrome+pc++32+bit+windows+7 PDF link annotation
    • http://volupixo.mygamesonline.org/valvulas_auriculoventriculares.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/teori_akuntansi_sektor_publik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6022dc2a075b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_600938469066f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_605d9fee69dc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_6005012672d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff654e32c56e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixejemazob.myartsonline.com/42194825747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8e909c-978a-4a08-addf-5df8bfaf3d9d/town_lake_austin_running_trail_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc7eff7-8749-4402-a303-ad6311bf39c4/what_political_is_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae751030-8d20-453b-b223-ed8513c8ba43/lasuzemubufuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a024afb-4734-4ac8-90a9-5c4f0e300b9a/livolovikojotemejorugewub.pdfIn PDF document text
    • http://vemameb.epizy.com/formulaire_aide_au_logement_caf.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/hydrocarbons_alkanes_alkenes_alkynes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af4f25a-7a60-44c2-9d34-375ed336bf0a/diaper_pail_regular_trash_bags.pdfIn PDF document text
    • http://gekasudevij.epizy.com/chainsaw_sharpening_file_guide_stihl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6865ea-8342-45fb-85ca-fe3f156a940e/vamojasedepaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7665d1-84c2-4952-9109-d2ab971358c2/woferajuwijironele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cc8296-389b-4a5a-8009-28aec69a919a/rigawofaponibakoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f25f07f-a1ea-40b7-ae98-3e175b5aafc4/gaxomemuranupoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074be4b8-3a12-4267-b677-89e18ef94b62/acca_jobs_in_uk_for_indian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36d6712-5695-4f87-b9c1-20418c9c5beb/jomaxenanifelijaba.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/wizard_w6_lesson_155_listen_and_answer.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_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 5584 bytes
SHA-256: 1a82706608951518c7d23187421b3420c4bb85ee98dd9947a9915fb7e45dcbcb
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10888 bytes
SHA-256: 2153afca21259946bbb0ee287458369a75544ccc3dc1d10f89e00b449ed3f5d9

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