Malicious PDF — malware analysis report

Static analysis result for SHA-256 682b99079118f163…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 01:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: deb6bc5624438d2a1828ec26c2571fbc SHA-1: 4cb17a214843c9b19c78df08aca132260da337bb SHA-256: 682b99079118f163d158a1b845323b761ec0a412c1b768343c7e11b9701e7c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=best+app+to+transfer+sms+from+android+to+android PDF link annotation
    • http://racecross.com/upload/edito_fckeditor/file/dawav.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2dd300f34eedba2a7f37d0a36aed9789/jivaxifi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/73956389805.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/74905231765.pdfIn PDF document text
    • http://trieuduong.com/images/Download/46227520808.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/12879236400.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/93948243596.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/solorudululiv.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zutifebo.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/tibinitejefadaj.pdfIn PDF document text
    • https://langumeistras.lt/i/File/5752314412.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gowagifixog.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/zefegiwajalavokebove.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454e872a00e---90434957730.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/84793302825.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zijidotobojudomotuk.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/96788548990.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/725661873.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/41964832653.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109011338404679.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/32352576708.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/14109966222.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pomenosofaguwevewara.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/polipunopuzununurivabo.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_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 10664 bytes
SHA-256: fe45800ddba54c88f8927fd18ef97bb1ce1a9016a27d729bc0e9b70319389461
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 17276 bytes
SHA-256: 4c9202a4d06d6fe614b2bceda43c539cc294c39693114f74e3e15f52837b9a05

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