Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a339fc0de42db47…

MALICIOUS

PDF

70.1 KB Created: 2021-09-11 07:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dad9d8e16da40b8d6c0dc24cdff1a614 SHA-1: 09f21183d8192f3809aa93201262182bfec4f032 SHA-256: 8a339fc0de42db471db4bc5b3173918e9cd44137726ab9b6997e5ff118785818
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=one+ui+devices PDF link annotation
    • http://teusz.pl/UserFiles/file/56753667798.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/86699376651.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/dovovujebonajotejot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe4b0f6df---woxelasofusigagexego.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091018032573499.pdfIn PDF document text
    • https://aneri12.cz/res/file/zemexiromiwuvujexunitu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b899edbe1---kofegarulujetupuw.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/sopumaloz.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/kixamitepobi.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/58932489211.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/96282457013.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/26566696511.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/jivadu.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/rasukuvakurudodufo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/8060331215.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/siposetadodubu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/50291487911.pdfIn PDF document text
    • http://retailcop.ca/files/67543015606.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zomesirorejifotetofigisof.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pewiletezev.pdfIn PDF document text
    • http://packturf.fr/files/48641406781.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/60987800112.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_off0000b3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 10028 bytes
SHA-256: 2d6fb89a5226a617b31657cea2681f077bf03364a969fe00408c2192873ef779
font_02_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16044 bytes
SHA-256: 2f8ed682b9958cec77bdcaf831a48faab4d189dd72801d88e87ae7905b9c5aab

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