Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ed7cc9813e39a8…

MALICIOUS

PDF

82.5 KB Created: 2021-04-06 23:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a361c3d79379781689339350c7f25ae SHA-1: c92c7d11198ee1ac378b7a9ac288f6bf617bb724 SHA-256: 52ed7cc9813e39a80d2666663d47a1dfbbde0c47681ea9bb5812cacfd0ca0e99
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 0.9961

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/123?utm_term=shooting+games++offline PDF link annotation
    • http://zelopaqq.xyz/exploring_creation_with_general_science_student_notebookg67jw.pdfIn PDF document text
    • http://3-bureaureport.info/14938454099388xb.pdfIn PDF document text
    • http://legendarycraft.ru/football_manager_ultra_tips8iql1.pdfIn PDF document text
    • http://lesantyqas.online/woguwewotovituxozawoxon8ycm.pdfIn PDF document text
    • http://mesretly.xyz/vunesafavowoxitutuvulaxughtji.pdfIn PDF document text
    • http://hookup750.website/608176303132amsx.pdfIn PDF document text
    • http://komarovskii.xyz/ralizumaziwukoj5inon.pdfIn PDF document text
    • http://testertumentum.space/estadistica_libros_gratisqroro.pdfIn PDF document text
    • http://mini-cam1.club/fusee_gelee_switch_guidefmrt1.pdfIn PDF document text
    • http://jadebey-x.com/kapef1slbu.pdfIn PDF document text
    • http://axecheat6.xyz/introduccion_al_derecho_abelardo_torre_libro8nyuw.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/pevonulafe_zisibenudele.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/6361f7adeb73.pdfIn PDF document text
    • http://huseyincanx.com/the_great_divorce_summary_chapter_104g0o8.pdfIn PDF document text
    • http://7evenrp.ru/26873411055d0are.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/lojevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_97301a1c306b4697b3b354f12ab2ec5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/will_judgements_show_on_credit_report.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_9bbf9d2d9f7d425f887ff71fabd40c97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mekajoraz.pdfIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_2a7596ef1e864208953a175358388c9c.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_d963681d1f5b428a887daae2e2dfa86d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/how_much_is_an_autocad_course.pdfIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_11748156e7e54c82b2ce8aa717e688c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/modekugedalokojeruf.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/gibijobawasetoduk.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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 5188 bytes
SHA-256: e1a9426c8ca18c42d7816054b0492b377b187cce3331eae707a9d89eebd66aa3
font_01_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 10576 bytes
SHA-256: ae64b7733b475d5b1486d6cc7f3b1e283c078a0f2dae4739c89f1973db5f1405

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