Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb0137b369ebb22…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 17:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81e1f2bc82cccda071ea26d6f3536cdf SHA-1: 622bf1e19d8efca126f2570ed39e52ce4567977b SHA-256: 2bb0137b369ebb22695bca5d6cd21b340774feadeb55145a104221a707108ac0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archielectronics.com/userfiles/files/rudiwikexir.pdf In PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/muwoluzixoboluzuxi.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/figewusanuduzu.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/12235371926.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/felelapomifo.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/belexitamafisexazalo.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/solevudibefenus.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ff2ebbb082b52fae4b5cf08ab5e1f032/33790952875.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/13124678810.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rovukilejetafef.pdfIn PDF document text
    • http://mrybalko.ru/files/wekovage.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/gososawapivaposuba.pdfIn PDF document text
    • http://chinalabware.ru/d/files/15523362932.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/10753755900.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/14475189618.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/55531260959.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916022835804.pdfIn PDF document text
    • https://avenue102.com/uploads/file/80981164373.pdfIn PDF document text
    • https://subarini.ro/mm/file/32192123590.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/78836557275.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/zozeza.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/pobulamomimezov.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/21779027293.pdfIn PDF document text
    • http://congluc.com/upload/files/36226178051.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/rapoxuvudaxedurologasad.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/55808460738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+file+to+excel+converter+free+download+softwarePDF 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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16160 bytes
SHA-256: bbc2600faccfb743dc62095bff55797063b819ec5f5947eab082762da4c9740e
font_02_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 10724 bytes
SHA-256: dcd4722de541e29d902176490e333a7bdacc45c758fa5c5d9936f2e15e56d399