Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30ca64cbeac0ed…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1784cb2420755259bd4d88f102f43d6 SHA-1: b441eece313d9732b8cbfbb72568fca0aeb87b9f SHA-256: 8f30ca64cbeac0ed43a13dd7cba92e2f8f943afd8d16f8afcda1ca6c276295c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, pointing to numerous external URLs, one of which is a redirector, suggesting an attempt to phish for information or deliver further payloads. The presence of embedded JavaScript and external links strongly indicates an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=best+processor+for+android+list PDF link annotation
    • http://devitohomesorlando.com/userfiles/files/fusetejemivizerinerodulo.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/53448510548.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/69857099746.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50936230296.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zuworafade.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/97011951023.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xiworukurakawugudu.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/85273874138.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/titatanog.pdfIn PDF document text
    • https://goodline.by/userfiles/file/86728267429.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/loranibinuzerolusedu.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/68189164931.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/45650117021.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/43538792773.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/51739845743.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad7e039d3---40953702448.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/16842310429.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091307581629.pdfIn PDF document text
    • http://devison-matras.com/upload/file/fabidiputa.pdfIn PDF document text
    • http://platcometals.com/images/file/66713739680.pdfIn PDF document text
    • https://epiphanych.com/images/file/mejumo.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/37235751543.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/14827381254.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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 10668 bytes
SHA-256: 8cedcdee6147388b665bdb2945fd07ab718378713ada8e6cf29f79f161eb0607
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 17744 bytes
SHA-256: ed263b5fae51d07549cddbd0f40f474349dace35f9eeb25eee95dea7efb9fb36

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