Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8901c8ceebdcfd5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8574131b570e2e0866c5159e24fc4eb SHA-1: a91c5ee3e39a73e94475585b19f6d8746dc85385 SHA-256: f8901c8ceebdcfd54ab08621fe69dabd762505d968c71bb71e9f47ffd63a6637
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious content or phishing sites, suggesting it's used to lure users to external resources. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a phishing or malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99549144a---niluxakiveminomoran.pdf In PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/69476780436.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/suwilisuz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88b66d20c---32199115587.pdfIn PDF document text
    • https://fond.ru/userfiles/file/19540411939.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/80724703065.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/ruvobefokuxa.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/54535703732.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/renusulud.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/76604972950.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109041424439053.pdfIn PDF document text
    • http://keitbg.com/images/files/kogipawisafovu.pdfIn PDF document text
    • http://lactopad.com/uploads/files/kewanozakilazisoxabe.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/34701215104.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xujugamul.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nutigojiputus.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/66750400406.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/gigax.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/morixagabobezarole.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163129191611627260152.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/19008521176.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/rojoziwulikimuridotozudu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/36690970657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kotor+1+best+classPDF 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://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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16732 bytes
SHA-256: 2ffb1c8794db881ef61069956e77d637f8c8db3ae5c292545e04bf3c1f18d22d
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10208 bytes
SHA-256: d87f9f5efdcb94d59a366beec1b9b6a4489dc4a618ccfde4836f26655d8ce3fa

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