Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a63ffe26a31fccf…

MALICIOUS

PDF

83.2 KB Created: 2021-10-08 20:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d58e947cad5165ab575a706bcb8fde10 SHA-1: b4c103134194cec45acf99a4cd43a3084a15a20f SHA-256: 0a63ffe26a31fccf30d5b20238b1666ecee1dba574878b8f549e4b44d95036c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://n3ss.ro/ckfinder/userfiles/files/xizegevesix.pdf In PDF document text
    • https://webmedcentralplus.com/userfiles/file/tegimojuwutiranubipoke.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/91664616288.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/30689247717.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/80738739794.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/4716982245.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/44801446175.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/tisopipazatimadazun.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/56892704113.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/42497244465.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/49262051094.pdfIn PDF document text
    • https://ghnservizi.com/file/42739283469.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1396a266a---37650291570.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/978050858.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/gufixokewig.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/mebisunibukuzunogal.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/taritilajetatelomekixalug.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/gujuxiro.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/bofol.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd89d2687a---19260461216.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/9113489242.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/73757610023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+golf+balls+in+a+small+bucketPDF 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 19040 bytes
SHA-256: d8674575a118331ac0438024023e79dd9d8eb722a4b120017137550a80e00bc2
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11104 bytes
SHA-256: 7592c244476bd897ba982915af09d19c77cf954a4b247949bd257c98d7eec9d6
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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