Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d73519b8d149a2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 22:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcbe7a4ac91a73237a349516ef73b046 SHA-1: 5dde71c45ce080bf27145c5c8f9cc8c77512b129 SHA-256: 42d73519b8d149a23edd049771218f48b5c022a8ee6dd68e0a47a71a024dc73b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are linked to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=vlad+and+nikita+supermarket+game PDF link annotation
    • http://alarmy-kamery24.pl/userfiles/file/vimatadugofixij.pdfIn PDF document text
    • http://chenruichem.com/upload/files/67340616711.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xewelabimijofetugufakid.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/zonokaxuwugeboxal.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141ce6707433---40003489554.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wuwixukemedusatifileminis.pdfIn PDF document text
    • http://tianfonmm.com/d/files/52516457006.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/23042405908.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/93854624247.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea555329f5---fivopupikipifizapojopa.pdfIn PDF document text
    • https://dellrein.ru/content/file/xadilad.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45926955099.pdfIn PDF document text
    • http://futboltotal.net/images/files/wawewakamekikofu.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/63078362422.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905151814.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sexoxonej.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/64219861387.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tomagajukufap.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/rejobarobunujagiz.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/29676999257.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/78660693689.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/41540463189.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/sunejusegujux.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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 17940 bytes
SHA-256: 6245147b4f78539833e3f725ce30465092c5b85359371c4d86739bf592ea2430
font_02_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 10776 bytes
SHA-256: 6da86cd35a7fd93b59f2079b6c5f0be0b277b5159a5b721cc74d67e546035bb6

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