Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce2b761fdabf47…

MALICIOUS

PDF

84.5 KB Created: 2021-03-28 15:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5690b13a0a06a3036977a7727d1a4a41 SHA-1: a40f300cd48680b487f5111fe94b2c0b1f88b8be SHA-256: 50ce2b761fdabf4759edb2836bbc99004ef93b3c1e64467952b94b66b8822102
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive 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 0.9993

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://dugedepap.ru/award?keyword=ccna+cyber+ops+lab+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408595/normal_6058164f0b9cb.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/zOx8hhG/18221627332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fe812388c206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5ff0238c1283d.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/imuHLFy/49288921422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_6016fa4441189.pdfIn PDF document text
    • https://cdn.sqhk.co/pakevetuzi/rdiashc/94328728866.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.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/ef707899-bc62-4d2c-a832-72f45c451526/abu_dhabi_mall_vox_cinema_contact_number.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_5f59f3d8143c4f5093d65ac6ad17c76c.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_e86d4567559447e685fd8a9275435fa3.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_2bb1a193770145b9a97d537d61eac740.pdf?index=trueIn PDF document text
    • http://nofiwes.rf.gd/57078865682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef5b686-64d2-4ca0-a73c-b7c2b12e3ad1/how_does_live_remote_proctoring_work.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_76524d986a2e45b690c1013ebd884883.pdf?index=trueIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_78c3dc5216cc4238a8c1ae9ecc52bd4a.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_4c48e3fc4a7e49b7beed70256d5301a2.pdf?index=trueIn PDF document text
    • http://xazabivi.epizy.com/fibukadimafofavigi.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_65e4c0debfde4b49a61bce1e2b749bc8.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_7140479ff7334b5fa7b93d1ba85a90b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01690f26-4f31-4b24-ba45-f603a54757df/does_lara_jean_date_john.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c5b9be-265a-44c4-a4ef-c66745cf1fbc/hundreds_chart_to_120.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_3c3910ceb2d4425d9f05380bd81581f8.pdf?index=trueIn PDF document text
    • http://popudedakajani.rf.gd/cricket_rules_and_regulations_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ea2d8c-39a4-47a7-9875-adbde8d13b71/80108692261.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_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 5448 bytes
SHA-256: 9c76c538a7391c28aac04290416c670c77898a71c9e307466737304fcb45f7f7
font_01_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 11036 bytes
SHA-256: e56aaaba822d035bc46eba4b5f2c4cb6c57e7c6b3479c9513428fb7bcd6e9051