Malicious PDF — malware analysis report

Static analysis result for SHA-256 915bace35c8c49f0…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7261fec617d5c14582bdd82e4721439 SHA-1: 108de51345376042f14b9abf5b85a61d13f83f05 SHA-256: 915bace35c8c49f07ece0b469e75b420e973e8f84e762f11a7e16f4900eb224a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a link farm designed to host malicious content, with one heuristic specifically flagging a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinarioscapindandrea.it/userfiles/files/93821985359.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/ganiwusom.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/lugogajalinodapivegu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/53245276706.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lobet.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/fozopeb.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/tilazugafovigi.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/biweromedepumowumud.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/61505192859.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/17187039254.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/59771588870.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/7481398803.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bekagakakal.pdfIn PDF document text
    • http://llux.vn/uploads/files/68101088050.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/73702194862.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/48542467426.pdfIn PDF document text
    • https://apra.pl/files/file/83478401368.pdfIn PDF document text
    • https://senfina.top/uploads/files/19068168186.pdfIn PDF document text
    • https://penzion-palice.cz/content/pufeniwala.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/2585299837.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/37544660413.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a332a2e04---duxenagiwarakut.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/bimakuvujaxukatalusuzunux.pdfIn PDF document text
    • https://plasy.com/uploads/file/73216977744.pdfIn PDF document text
    • http://greenld.com/userfiles/78746174478.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/tetixopoxanar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+butler+movie+online+freePDF 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_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10420 bytes
SHA-256: cf84dbc8827432a1a92931f6e4f82f71f912b21b6b52ad4b77d898ff0f53212b
font_02_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 18064 bytes
SHA-256: f26913011b7c850904b279d4c8ca20125ed0ec4b591648d8e1b30f5a546d3b7c