Malicious PDF — malware analysis report

Static analysis result for SHA-256 5879361117648df2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 10:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 510af5af7c41e98b6251417bfd4257a5 SHA-1: aa2aaf8c3471b8b5a3439cdddb8e04b0a77e4318 SHA-256: 5879361117648df2f036ee33fdd35ce8cb3f3b354a60228e30aad87516a37eb4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, likely to obscure the final malicious destination. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wheelmartthailand.com/image/upload/File/88439338484.pdf In PDF document text
    • https://adrfarysz.pl/userfiles/file/94206510877.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134873da3640---78650430450.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/69505342697.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pezuturitilexonofasi.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/30245109776.pdfIn PDF document text
    • http://effektfilm.de/files/file/rabunitupilisananomis.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wokiresepizijipunarew.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/pomuso.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/825c403f4d331d1ec0b2f3b298cff2a1/vudosubixozekalegif.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/73932173589.pdfIn PDF document text
    • https://rintrans.com/files/97537485810.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/jabilivisem.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/waxetejupukim.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/nexelufafexim.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/redovedilenidorezakiza.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108312054517600.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nagomaxasegebewofosoti.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16141591617.pdfIn PDF document text
    • http://wernitznigg.at/files/91862325198.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/jaxajupiserol.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///50396918540.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/84765760094.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/72254527244.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/95676562902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=requiem+for+a+dream+violin+sheet+musicPDF 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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 11100 bytes
SHA-256: 771275b1ca3d9d6a7cf97ed7cc2838f36effcc67bd38bf595414a707f4f87a27
font_01_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 17188 bytes
SHA-256: 5f1bbd75ee3fd9592355d46216d6ecf4cb84527ac41bac9c03be72ce49966205
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1