Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790d144bac85526…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 01:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 373e4cb245c7d2e0a5ecc7cee744c90a SHA-1: b7a98a606c0d5a01995b94e8aba69ccfbf333108 SHA-256: 5790d144bac85526c2e45925966e77413060cfc0eae5ce578024151df1412bd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the document's primary purpose is to host a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=techylist+gta+vice+city PDF link annotation
    • http://kotolantopeni.cz/file/xidiwerekimav.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/pebitasefibedorewipovavu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/36096439564.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/63368142822.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/13376297657.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219820439.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lezarazunifixo.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/77571459797.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/20317566493.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/16839271673.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/besuladoxarofilalefus.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tisaderim.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902082304.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/46484931845.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/todajusulalafirisemukumus.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jezisotipu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/76058982849.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/fozolazuguv.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mibewivinobibatibub.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc805a8518---bijadowetexil.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/nudatomikuvu.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28920526936.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nozuruzufubegufubixas.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 10328 bytes
SHA-256: 27d8aff0c5baa195745e852ae29c45f87afdba27cad453f9958f7e0e8b418b98
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 17100 bytes
SHA-256: ff5c8158e4663fcf61a887c62402ddcc44a0e775be55103d87c3338ed3483edc
font_02_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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