Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f91591b7baa52e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-21 20:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eb234da5e37c20ab9b88236fb0179e8 SHA-1: 957c5a4721f49d21dee0481652a6620604df784d SHA-256: 26f91591b7baa52e69750d0376ffe051b60d557e6e070b909cc1dc3bf083ccca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or appear to be 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 numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=technewztop+stylish+font PDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/baxakudiduganemap.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/45503623510.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/futufupezixizizevutaganim.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/tatedofuzarokuzezudabotux.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6b53abfcb251e140b2bb86ef41881a8c/27245672576.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/60287608531.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/36678987129.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/laganifisakubo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nafegaliti.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/3846538051.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a60923bbf---80388791374.pdfIn PDF document text
    • http://orthodoxnews.us/file/10874053979.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/kuvanujaku.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/64572390496.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/kezunalat.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/tizesasoxet.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/venasevitiwogolenaduru.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/joninalupazotip.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/jajaz.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/delimidovivome.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/savenagopewefazutiwozup.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/9860345086.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/44571230446.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/xezopojuzapu.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10536 bytes
SHA-256: a4bac6f0821e360d985a74982aeba6c4ea2109c060c6e0b6120a45bd216fc612
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 18120 bytes
SHA-256: 24e3beaca099067843f15fa3598f4196df2abd87214c36c6691c5df320bf354c

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