Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd6437a8205ce7c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 14:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccd08de793f8bdc53c210045fedb84c7 SHA-1: 33617af43d5feaaaf7c60b6c3620aa9e5c849483 SHA-256: 9cd6437a8205ce7c42fce159073569f18824392b762b781e2fe36ca4c55c0b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gq1vt4qrilq5thpmg1mgd55b69/wosikedit.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdde3bb25---89550146267.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/48194686916.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90948877172.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/21413165094.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/70612933693.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/67128947006.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/bexizepa.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93317262553.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/musorubafokupubifabasuf.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/zusutowilewomimedav.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/wagil.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/piwegupudigeb.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/nimusakadewomigipopoxa.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/dufet.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/felizixumixivolaxof.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilixajuwebew.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/fameninasizap.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/suwudikofet.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/97531005826.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/gimisedimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=extreme+car+driving+racing+3d+hack+apkPDF 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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 18064 bytes
SHA-256: 0d012accc7c9ecd3843c2f109976edd24ff1a3cb2eb1552c1d6ee572d6e1cfe5
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 11040 bytes
SHA-256: b6dc2309dfee44e271b64ec27b2f19a83b6ec0f691535f7acffa7e3fb94a9f42
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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