Malicious PDF — malware analysis report

Static analysis result for SHA-256 9953f7c2c790c5c0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 17:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2f4d9ad90506aae34c2b9a3d35fcb7d SHA-1: c39ee9662f3a73b31d9f9d0ec8a7f455f6c3913d SHA-256: 9953f7c2c790c5c0ca28ca42ddeca1ad693ab884b49db96b49a49f6b57151013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious sites. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes, including malicious ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=how+to+get+pokemon+go%2B%2B PDF link annotation
    • http://szwygs.com/upload/dagefarovolaxiburewe.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/8943684138.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/49116064742.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/noxobej.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/86937986451.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/6002726945.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/fuxijepipanudesugexapev.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/79565123183.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/wowalivubulada.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141680945d43---zitimukikilupamekasixul.pdfIn PDF document text
    • http://julianina.dk/upload/file/80152104549.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pijitenolofuxikoxurevos.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xamewefigubofegopozovosat.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090815191138.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140bfa1091ab---sawofewakeduwefagulobi.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/31134230180.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/somafepavuloxurulabeko.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/60064095288.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zukemixomesaw.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/70175562760.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/kopuravetuw.pdfIn PDF document text
    • http://bastola.org/userfiles/file/37429383032.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/84667799593.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 17712 bytes
SHA-256: 414910c38bf2531bb5b4f6f88d7e76d37469d760dca47afbcb469d1e9e28f0fb
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10196 bytes
SHA-256: b3b61cb36a14cf3a91d490cb03733012b7179c544edd76b97ed74d77c8140535
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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