Malicious PDF — malware analysis report

Static analysis result for SHA-256 933f823f0fa95b13…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 16:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27a72a224e3c9609cb602bf1c2be6bdc SHA-1: ddae489db430efe02f5d187472161a746ccda1fa SHA-256: 933f823f0fa95b13372c1e33f47bf10e551b2360d03e66f39a1e3250a5307d9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vaynhanh365.net/contents/files/kibed.pdf In PDF document text
    • http://vattuxaydunghl.com/userfiles/file/8163445497.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/25303998199.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xubowigivubedis.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/61776451532.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vupinesulatoxunitajetero.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/97339766781.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jogexagipizopaluz.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fejiterovuramufufisazafag.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109031912277843.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/lajejabukufuxame.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/97637257812.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/47920899499.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/buvuxabasazenuv.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149d4c5781b4---89322336909.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/towifexabiladudixoz.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/navegijidedimevigajal.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999234ca6d---396489366.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23662185209.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/zoberofelalejogivuvad.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/vilutiruxev.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/8566640179.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/86687209864.pdfIn PDF document text
    • http://tulga.ru/editor/files/40561308718.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/28478281012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mario+kart+8+wii+u+emulatorPDF 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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 18088 bytes
SHA-256: afcb70e8455e2708988407f49de9c7f077eb19f55bed190d3e782ddc072ad148
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 10476 bytes
SHA-256: 3b3719cc4cce6234b140d3963cecb65c16960d0369815e99e426c3a4b4806e30