Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2a453bf6c3c3d4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e21ca95780d7d1a8ab4a0046c881f6c5 SHA-1: 3043db26de614b9b873050d6c4aa4db15eb284ca SHA-256: da2a453bf6c3c3d4679234408d9577de26e7f145f4442449ffbdc1725bcba35d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware. The presence of embedded JavaScript, though not fully detailed, further supports the execution of malicious actions within the PDF.

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 https://archism.ru/uplcv?utm_term=how+to+spy+private+instagram+account PDF link annotation
    • http://rockefellersgold.hu/editor_up/49843334884.pdfIn PDF document text
    • http://terrietanaka.com/library/files/saxemegax.pdfIn PDF document text
    • http://grafitym.kz/files/file/sitinireniruvuronujinu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/goxatawuvisasiripuw.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nasemenafuzizobamoxo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/74061646274.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/dexatepelasozetulizekik.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/13438368281.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/80910381433.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97d321d049760b0afd6dc8db8f4f4c39/95080739682.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/sonugagojimu.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/97120333079.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/sisijerexuwupavarifuxu.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/36026443845.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nijitapetatisulowev.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/tumijoxanugame.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/24073036870.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/57510411211.pdfIn PDF document text
    • http://devveb.net/userfiles/file/28876095810.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614512f98d661---ramezuriwepalabi.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/lirabadugot.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/biwobumivumugu.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/11189968031.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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 11028 bytes
SHA-256: d794f34f8b4f930951418e45682e24ece4d74cf147cebdbca9e3c1dc39e75c84
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 17580 bytes
SHA-256: 563cbf2593f001e91aaba34ca9699729466c0d9bb9ff32d26bd74777a14e480d