Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d08e61343b57cb8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 13:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3e152904897bba2bd6e7f7c122ab4e2 SHA-1: cdf3084f055296641abfcabf8fad75f4d1fe6dac SHA-256: 7d08e61343b57cb8f15aa3668e61fc4fa34488ddc6cd8ecccf088074b5ff2ee5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://babijie.com/upload_fck/file/2021-9-2/20210902105850936886.pdf In PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/pimajagamojutusegumex.pdfIn PDF document text
    • http://canadanur.com/resimler/files/mopajinumezarebaze.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/3904770988.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/66581090310.pdfIn PDF document text
    • https://kermanrooz.com/img/files/jegetevafoberuxil.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sijegivepikol.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/85351201550.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/tisezorekorejawozupeper.pdfIn PDF document text
    • http://kgmda.com/upload/files/44363680900.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/nomeru.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/4352622826.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8na3bihf4sufbf4iaau2o9ka8s/49783011426.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/nugagitosegokubetirune.pdfIn PDF document text
    • http://erex.hu/upload/file/buxuzopozufejipibuda.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161387d37cd9f1---64459290903.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/66429009890.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/3093167449.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/1401165040.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/64712500723.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/nisedevagefi.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/20705224719.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/xokeroxewujebeme.pdfIn PDF document text
    • https://atl-50.com/files/file/55873786810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+frozen+online+free+123moviesPDF link annotation
    • 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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 18304 bytes
SHA-256: cf473b1ecea10b61b2de6e18d94dc7092cb730587e36728689f52b3a0f6a98dd
font_01_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 11064 bytes
SHA-256: dca566d8faf0c274df433c1bef24b8b95db6102199bbb8f932f01243c12d125c
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1