Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d04a9b747408357…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 15:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0ded4b27d9720cc520f8676d00e9de3 SHA-1: 52628ff67086ec4c2c65b12dff3e56d17235e1e2 SHA-256: 9d04a9b747408357d9c9d26f62422f926630daab510823bca4cc12ad3a06ce05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or credential harvesting attempt. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the assessment of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rainhouse.kr/data/editor/file/4821674996132cf40e6003.pdf In PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/69037871332.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fatobojavixozi.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/lukurananenasevanefo.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/lefet.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zobutatijujod.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/66732859506.pdfIn PDF document text
    • http://boldogelet.hu/media/bafuvirakapezowidutu.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/60480239019.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/rekidabixodejo.pdfIn PDF document text
    • http://partnercable.com/files/zobifepabisiwexejuguv.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/43821339045.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/10694450658.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/83931096201.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_17_45_34_9710.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/62901100180.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/bifozewijoribeletem.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109021428384448.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/83761343086.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164784654f---vujukutuxixagukukiwumin.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/43874957992.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/84029636077.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee9b79634---54860877089.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/88641072889.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19832534868.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/77980984343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tamilrockers+latest+urlPDF 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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 10440 bytes
SHA-256: 0ff82c1bfdc77d95e70e1863e1dd16fdc5a87750fba5b874b9155305a0bef065
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 17588 bytes
SHA-256: 9bb1e89123b500e96c1610d4187809779b68348a9bdd11a96d461cff68cda775
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1