Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2f3d4b824a65d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 09:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21f39ffdcb13d563ce30e4e9c9764883 SHA-1: b06e275ae3be9be2692de7fc881d432d433c1833 SHA-256: a4c2f3d4b824a65d36ee06d82dcb940f13959925899ae3a5185e380602ebe97e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious or untrusted domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and the presence of many external links align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://perfectprojects.ro/userfiles/file/kogufubiwutafutoremik.pdf In PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zazuzanovow.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/31287955877.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6c1620a6---9709717781.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109112018153046.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sijaxalesoxiliburitefajim.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zuvogagunabinafafedaki.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/xexisisamerosoxerunusaj.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/93237015015.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/voxijepase.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/jiligukizevafoxijif.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/vazerukatanowi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/dilatulifalasojatoxadepe.pdfIn PDF document text
    • http://wwstationery.com/files/file/91403298689.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/disav.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/57199631639.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139233171ae5---25434745274.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/7080311543.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/memobefedodopazif.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/wivusesokinudoja.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/bazuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lords+mobile+hack+modPDF 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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 10624 bytes
SHA-256: 5487874e80677642a119440200e1841a3b1fe7cf97763dafee7135ab89cc9ebf
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 16164 bytes
SHA-256: 66b62f428e871f92ce79a46a0c2922934063859c12368047d7b5563d6e098a02
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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