Malicious PDF — malware analysis report

Static analysis result for SHA-256 566555d53d7be49e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 12:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2183bf98f526efa1dc9458f5e86e500c SHA-1: 801f31bebab33d932d35530bbb74cf059c18552a SHA-256: 566555d53d7be49ea4bdb175f845e99375c90b881b0234d1ae47eb950aba9553
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ottuk-e.org/userData/board/file/kapefunatadoponadetatow.pdf In PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/ragatewabudebalev.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/39632366940.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f84420e63---15459223069.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zajugigadopetusopif.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/54940779454.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/putiwipesinazujewupax.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/kumexesixupopu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • http://pjteam.hu/uploads/52882787197.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/vomukadefujewel.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/79447627057.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/99250548402.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/34779912356.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mogaxeli.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bapafokujotepovifakigoni.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/5203574535.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/timufuj.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/mupanikiwedorefabizewo.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xofuwukub.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vevolinebizeza.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/migigoxuvaw.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/85465066520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=top+free+drawing+apps+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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 10576 bytes
SHA-256: 3501195d41bf793da69c4d36e24e85eab432f99b3f0ad73b9213e589161d19c2
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 17752 bytes
SHA-256: 53511cdda5505678ce442c2cdaca9a1adf581ee69464f0adac5ccee5e103182a
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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