Malicious PDF — malware analysis report

Static analysis result for SHA-256 9970dfc6a51aca55…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 05:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06bf01d18ea81dbe0c01c6a3e6ee3798 SHA-1: 0ffb32bb6ebf29bd707c6bb589cc417eb11e3df8 SHA-256: 9970dfc6a51aca552ae145f0a2f0679a7c5193b6c4dac4f4df84176ef9fd8122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to unknown domains, suggests a link farm or redirection mechanism designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.larucheapain.fr/ljk/file/tufinutixibewijixogi.pdf In PDF document text
    • http://carbontuning.ru/file/74879541119.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/raxuwufoxil.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b131536c5---viwusizuwusevuwumuluwado.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/4971951047.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/19249369848.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f1f6ab1b75cab5d4d96b0ec8698aa466/4270884220.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/99939359101.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/91070502975.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/sorusi.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/18703045854.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/15516195645.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/84478857087.pdfIn PDF document text
    • http://packturf.fr/files/sativopijanufixaviwudar.pdfIn PDF document text
    • https://satesayap.com/contents/files/53357163806.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/91748546485.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/65652196110.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/sasexe.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/fekosejoz.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/linisuzofon.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nidijuwolebovulifututav.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/24160883812.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xupavaferifazazelalikumij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=periodic+table+wallpaper+for+androidPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 17052 bytes
SHA-256: 5f8227ba98aee1254d0231d3c728cef49556039476c7897a8ba7b6903a031eaf
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 10672 bytes
SHA-256: 2cf83e13b64a9279f23c242adb02f429d01b480ef84698c857c815c53acbde64
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1