Malicious PDF — malware analysis report

Static analysis result for SHA-256 5725ef5fb4dd5611…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 04:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c690c1fac751c014df81ce58da0bb408 SHA-1: 0b580d21eb2b709fbba44ca53704f3736a61991a SHA-256: 5725ef5fb4dd56110cbe1f200f3147e100c0ed1fdff54307383a804cb763b59e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful websites.

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 https://allytemp.ru/uplcv?utm_term=samsung+galaxy+s5+micro+sd+card+slot PDF link annotation
    • https://tamphuctriland.vn/upload/files/xapuzekiroxidu.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/mixanesoraju.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/tugizigofotogipavorivo.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jafaduvezazu.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/vaxowemuwotofis.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/bijiberepigomasavogib.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/72452382333.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6407990724.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/38186570213.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/90279319043.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/21814908330.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/rizimumup.pdfIn PDF document text
    • https://orangerun.re/photo/files/45525238420.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/70136389372.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/15262063695.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/vaxeveroza.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/88802247102.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18623918151.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/4079645888.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109112059383090.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/27687109625.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nikawiwavuvo.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/5736466618.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/sebasonababojaragerop.pdfIn PDF document text
    • 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 14516 bytes
SHA-256: 603a97f454dd7dd9682cbace3080804847899c4e965e0f91a10930863ffeaf3d
font_01_sfnt_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 11104 bytes
SHA-256: 4de7a8a27c8db33de9974d9754fd4b41dd6021c5c33edf962171ae876c631544