Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf5e8ae1570caf8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 08:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20994e851ed8553c135022c826f7563f SHA-1: e15e4734e5b384bec132031a28c75edd86e30280 SHA-256: 0bf5e8ae1570caf8d4c0c0b09964995e8aff294de48572a917d9a9a5bd33a6c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.almuhja.com/ckfinder/userfiles/files/48831514743.pdf In PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zowemogurilefir.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/wazowazuvuso.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614137d69b1a7---wofatesedib.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/14800458643.pdfIn PDF document text
    • http://grimastone.ru/files/55263887689.pdfIn PDF document text
    • http://principesgs.com/userfiles/file/wufalejorixobipoxevefix.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/9774531553.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/deloli.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/81194066275.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/88203556181.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wofumagudiw.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/pejexuwarugikalifagesafe.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903031738.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/17120030158.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/31846428472.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146883b6403b---20581104220.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/turaxilixoke.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/88005809250.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/36372386645.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/18698290292.pdfIn PDF document text
    • http://abnicum.ru/files/file/babidasunosotuwezu.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/petimuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=unturned+bedroll+idPDF 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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 10156 bytes
SHA-256: 1da66360c4f49c4d13800680ebbc4667d33cbfc626a01cdcae84257ce53c4f9e
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 19036 bytes
SHA-256: 2b5bc90bba5ac96b481b23c490f994ec280c72f8fda7a639de886c55bf0cbb7b
font_02_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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