Malicious PDF — malware analysis report

Static analysis result for SHA-256 6807a634c9c81850…

MALICIOUS

PDF

98.8 KB Created: 2021-09-19 22:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59d90cb66bdf5ea6ab3f2d8341842fab SHA-1: 75a01216eed79f6a0d3e8a1b057d8641aa1696da SHA-256: 6807a634c9c8185032f7fbf6a5aa6b112bff87d13f4bc8b4beb5c88360cf6486
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 hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=android+createbond+example PDF link annotation
    • http://rosabaum.de/web/editor/files/zojobezusizip.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/9015481408.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4988169---7020087647.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/82300111900.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93765551862.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/97459380039.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/87050378549.pdfIn PDF document text
    • http://armanetti.com/images/gabiwapamidirapoxoviwodi.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/85771977854.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/bezalalazenof.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/48885316837.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67161139200.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/40872018577.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/81414742381.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/12980132159.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/fifebefivujise.pdfIn PDF document text
    • http://merwepizza.com/upload/file/juberolefavumas.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1c03552f2c2f368e50f59007f2b68bff/butiritegisasadunulumet.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fibirudunigawisan.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c3a0354148.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/37089229560.pdfIn PDF document text
    • https://tcremich.lu/files/files/zogutulureb.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/nikonuxumoze.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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17512 bytes
SHA-256: b9f07f4b377a4e3ffc37f6d05550986538518a25293e2b76c89d259df279c296
font_01_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 18728 bytes
SHA-256: 7c5d2cd6f4e6d71b0164d58426c033b21813d060f6782a5217058fd0c7991a77
font_02_sfnt_off00016541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1