Malicious PDF — malware analysis report

Static analysis result for SHA-256 961adc52cb754782…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 05:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9887eb24249bc63b657903d3e86d2e26 SHA-1: 96c8553c970571d4101a3ddaa2bd5c6a9b1127d5 SHA-256: 961adc52cb754782a3263dba56f2ae063155948bef39b527a59a4f8a9c6e5ea2
126 Risk Score

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 0.9992

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://dugedepap.ru/strik?utm_term=electrical+engineering+tech+degree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450732/normal_60435c57bd297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408864/normal_5fed53bd70476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_602cda29e4c1c.pdfIn PDF document text
    • https://cdn.sqhk.co/fixikumeboga/icFhagg/creative_writing_worksheets_for_class_5.pdfIn PDF document text
    • https://cdn.sqhk.co/dawezizupata/gGihgcu/just_dance_now_apk_mod_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_600fb379ef4e8.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gejeu2y/87854563410.pdfIn PDF document text
    • http://towudunef.22web.org/61917108638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zagubip/gelijukorukitasosapep.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_4565d1dcbe494f56ae6769b435235ce1.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_79b4d719b9c34e84a02dbfc268876f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/tokorafipodiletasofogere.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_7e30d8aeff4f4aceaa0c48e03e4ea8d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/guvevigukiroj.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e0859fa447094a94b2d0b8f63197d793.pdf?index=trueIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_1cee6e11c7b54d4eba5d6edaba55b0fd.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0298ed10cea1440bb45c4e06c8884bfd.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_80da35708d9c4eb7894a0e923937e635.pdf?index=trueIn PDF document text
    • http://gasikogo.rf.gd/capacitor_bank_schneider.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_7481dc27d45d45878ad5c2481f1840a1.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_01c60b2ebac54a0dab466fd3985af2b0.pdf?index=trueIn PDF document text
    • http://lamekukibudinos.epizy.com/69178085414.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/addition_worksheets_1_to_20.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 4660 bytes
SHA-256: 88082c469e8f3751b2acdb5aac576f54e00f73585f2a7e5762fb00f4566bc390
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10692 bytes
SHA-256: e5b506b902ced84d23599daffd77a7bf587d4a3e4e51b39c0466e7ec32dba88a
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3