Malicious PDF — malware analysis report

Static analysis result for SHA-256 efadaa003fbc6b37…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 14:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 902a78e195713824d0e99c17673f4edc SHA-1: d74209a79a59e3558edc6ddf8452a2251093836d SHA-256: efadaa003fbc6b371c57da5de3428efbecd05f3c968dc1f014db237cfb3c3a3a
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 0.9975

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://synerhu.ru/uplcv?utm_term=outlook+for+android+setup PDF link annotation
    • http://hndgyl.com/v15/Upload/file/202196913195962.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/jimibukifevadinokapi.pdfIn PDF document text
    • http://balalajka.nu/media/sutiwadubexavalokogalo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b95040cf---92369088736.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/2680010436.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42309076824.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/22495166599.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/jazufuwivor.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/22004157113.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/zejubot.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/jijekupevofokukujupam.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mirezolokewet.pdfIn PDF document text
    • http://sungder.com/upload/jixakexuxenese.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/4872422661.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091436323800.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5969a9a4---52503456629.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vosozodesiwo.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971533126807.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210903_243EF14549EFDA35.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xogetoj.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/55394027783.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/fulatimemuxegegosabu.pdfIn PDF document text
    • https://toocapen.com/files/vekuraded.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10708 bytes
SHA-256: ae3ec8a3dee34d3bc3c1ad7971e1bdad33cdafcac7dd805a295c8166fe12f6de
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 17868 bytes
SHA-256: 587026cfabfd5eae3148a401759f97e2cf60680f40baf9ae10636f73057a4469

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