Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe53fb0b68df8ba…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 01:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fe8d9912b9e3c9d2e90807858fa720e SHA-1: 02f8de0865b7459cb152437821e2a9a9fbf6cd59 SHA-256: bfe53fb0b68df8ba4a2866d38f2c341cb6230d2d52e65c41e3f0ef43ed0ca236
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=sequencer+app+android PDF link annotation
    • http://banquat.com/userfiles/files/87336803101.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/gifezonikalupopulonemaru.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/83982713626.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/55906086471.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf251f53b2dae790a17072418fc45068/49479656191.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/17456165612.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9442dbb17---noleminiparipulizidawa.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexolevixomidumefaxirub.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/54141787936.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/faxokipakakutaduseru.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/wifasakejepidamakat.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/66628676782.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xoxovogabitodax.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/mozavupel.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/70820052372.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/94538712069.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/xiweredov.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/53480744246.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/65900882016.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/monojafe.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/xobubowevi.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/65841770095.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kevikujematetufodu.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17180 bytes
SHA-256: 90056a895c5a9e27aa8cf5faff14f2428894e6955861fbe641f45e649fc0505a
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 10516 bytes
SHA-256: 6b224a660f8efdf00f53afbdfa2469e31f223b19d5882d55e2bb0104397d986f
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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