Malicious PDF — malware analysis report

Static analysis result for SHA-256 08df754c5b6d533b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 06:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54a716ea14f16af4c4f6bfc07f5b5ba9 SHA-1: 274754552aa6d437378090285ed0c920e00ae89e SHA-256: 08df754c5b6d533b2f473fa4fdfab89a50e6c863be85eb4e82ce55b4b07645f2
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature by directing users to potentially harmful external sites. The file's structure and the presence of numerous links suggest an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gatewayhotelbangkok.com/upfile_hotel/files/32707481399.pdf In PDF document text
    • http://huh.hu/UserFiles/File/93523681646.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/debopo.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/4637666963.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/57538823277.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/radeneta.pdfIn PDF document text
    • http://taociren.com/upload/file/210914013129742252yy2ejp6po7gg.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/26596692214.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/jemonazowof.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/batanelisapagedelirav.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/digiwaforitetirepokemi.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/vanafujumi.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/55863027374.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/41821076895.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/81267127570.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jakimusulukijelumo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/2646741906.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161373a0d45841---sigabemuz.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/25593318730.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xekiregadunosuxubawiso.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/24925474241.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/84313594771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=change+language+on+this+phonePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/kajasuwikexudux.pdfIn PDF document text
    • 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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 17048 bytes
SHA-256: 0ad977f921e458812e82b2c17ae42f8c80bbada578778c2b6698a7e3441cb3fe
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 10560 bytes
SHA-256: bc0645ba17b95917d49d37fc6d228b03ea6795a5b8c9f0a056b5dca9b4d725f4