Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc1869b59aed43…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 17:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 621ea198f32d6018b00702fecf66c86a SHA-1: 644a386f1b31916daed7694db71ed2b918ac028a SHA-256: 55bc1869b59aed43f905e4ccb9012ecb2bde06726d0a97b4130c04d5a25b8f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nutstudio.it/userfiles/file/ladazagak.pdf In PDF document text
    • https://gangnampools.com/contents/files/66477447031.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/gukoriluzitewojurolobarov.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/xuwesopelazibaxu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/33554122204.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/65026313305.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/xomopajeturumaruxazu.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/13687206873.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161455497d1e33---90984725202.pdfIn PDF document text
    • https://blv.by/upload/editor/files/janoxowan.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/dajowadozosetopovuz.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/78984524022.pdfIn PDF document text
    • http://spbi.cz/res/file/fenikowogugovasefupu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/77434108417.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/11757178452.pdfIn PDF document text
    • http://coumert.com/images/file/1097621149.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gazeri.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630846743.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c0c83ce805860b3fa21f7575f72b28/vagidiketamizilaxemova.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/75641128441.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/vozezixefegafexokelewili.pdfIn PDF document text
    • http://hexindechem.com/upload/files/30289020511.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/18706794004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=contacts+pictures+androidPDF 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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 10592 bytes
SHA-256: 8eb768cc5d0018dec733fba33d2a241bc8b7da89251de43ab4b0aedf6a18ad2f
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 17088 bytes
SHA-256: a3f048633297c560e9414a054d482b6476e729a9aea2c7f07ac294b6a2bbad25