Malicious PDF — malware analysis report

Static analysis result for SHA-256 2785ecaebc603a27…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 03:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77e305f78e5cc900beccb2775a365261 SHA-1: de99be48d0fd9678944aabb3332bcccd75ce28a2 SHA-256: 2785ecaebc603a27254001f392c1e2e24c54a88c412f7a72470a6991702be8b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML 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, suggest an attempt to direct users to potentially harmful external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics strongly indicates a phishing or malware distribution attempt.

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://rungruangsteel.com/public/upload/userfiles/files/60708837825.pdf In PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/83899831127.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109180121138651.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/45265286768.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zawadisixub.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/79681130120.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/timafeju.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/3230672757.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fulowolirovuji.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/74625250402.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/89062017561.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/gesuronedosimuwu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/zivowududovesenelup.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/90948916263.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/61664361001.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/73386645496.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf28705af8---fuvobitedagumolafim.pdfIn PDF document text
    • http://one9five.com/userfiles/files/75777780950.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/dujumoma.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/xowedenewukutipuxonowiz.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/6759578535.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/ziwatad.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/16864885793.pdfIn PDF document text
    • http://drironcat.com/images/file/55304627172.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/gofizabovovakanokemif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=immortal+life+meaningPDF 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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 17208 bytes
SHA-256: 9952afdc0481744122e3ec62c412732b7387f046c0139c6e283e6a2caa104e3d
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 10340 bytes
SHA-256: f6b3f7e457457f5dc4a5e2df7dcfb2e215b381ec6ef659b8cd03074b2bf13b3a