Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5d7e081ce6d2e8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a458cab3226665afb5d765e998f237c SHA-1: f05febcd7113606d8c2505c4369f4a2d5a3bfbda SHA-256: db5d7e081ce6d2e8d668da3c4cd7384c11dab775dc5832254eac57e9f4624219
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed as a link farm on disposable hosting, likely to distribute malware or unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://viral-list-machine.com/ckfinder/userfiles/publics/files/2763029418.pdf In PDF document text
    • https://bellcera.60km.com/upload/files/52366223569.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/rorupujedu.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/dadowafifujivan.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/19776611773.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bowakoxikinofexox.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pokobesifuwalekugixetok.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/64646434480.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/maguxunegivamorisatig.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/65578639676.pdfIn PDF document text
    • http://blgjad.com/upload/files/kikasasijevizibotuv.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/sozobevonagebimeda.pdfIn PDF document text
    • https://istanajp.com/contents/files/78606702122.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wavev.pdfIn PDF document text
    • http://retailcop.ca/files/81815430452.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/21065227355.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/15740840228.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/7492592647.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/dewawajifod.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/dibisikenibozozilu.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/limosenopawosenerot.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/gefojavijubeseruzukomenos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=telegram+plus+apk+downloadPDF 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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 17624 bytes
SHA-256: c8507a65e964542e2ac2d95822e4aa03257f6d5d4cbd8a3c1429353a5b8a7fdd
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 10784 bytes
SHA-256: fd9c8f71d11d3d2cad1913cda7ce52da9a5ded7b8f5e704bbfdbe381ed515d24
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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