Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc047a79cb90b5c8…

MALICIOUS

PDF

76.3 KB Created: 2021-10-06 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ab29aaef5bc8e2984fc643c95e6ce3b SHA-1: 4c3fd6cb2b772b7248d78eb6b04c661757f00c73 SHA-256: dc047a79cb90b5c8a3e42028832a4788d498f947a6303974a87915551df27f13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.agenbenangbandung.net/file/22632335542.pdf In PDF document text
    • https://deesudcoolingtower.com/userfiles/file/27878383113.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/wopebarumikebenefub.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/69679058865.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/39295013622.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lafatajupubawegasew.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/60935064458.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140958f88626---fulupazenoruzo.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/fulubewajodirenisiwose.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/kewoneraful.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/30058144199.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210921065635.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210928_EF41C8F0312BEC7C.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/44858079466.pdfIn PDF document text
    • http://art-ball.net/files/file/fibazeritevaxuranejidan.pdfIn PDF document text
    • https://quizai.com/uploads/files/34910153011.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/11082335144.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/31162187330.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153032cb386b---15727374272.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/80131875412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=one+gram+in+mgPDF link annotation
    • 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://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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 10044 bytes
SHA-256: dec9c374ba1bca00a72a1d6dbf51f147e8037e48790270f9b5a58c6410aeae4c
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 18116 bytes
SHA-256: 7595522e85c44fd59017c79f2b4b364bc396855f2ab262cd439288d7ef99a842
font_02_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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