Malicious PDF — malware analysis report

Static analysis result for SHA-256 65021135e5afd3bb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97305359e222c1283b826e0ac6b3af52 SHA-1: df23470a6c96c2e78c77a437c30ec97592274486 SHA-256: 65021135e5afd3bba34b5cbf20e04c897612f60efff2ec3e4b77f362e5f4a5ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://eptesteplelek.com/uploads/file/47372371398.pdf In PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jepodifewasirigawegaro.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136b66cdef47---wivudiniwimonak.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/92974914694.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/gamerinuzaz.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/dudovojepava.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/fifapekov.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/76587858127.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/24382152457.pdfIn PDF document text
    • http://dobermanncz.eu/files/xirigamevuberixojabupef.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/32380612414.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090814052271.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/83606089827.pdfIn PDF document text
    • https://architektor.ru/uploads/file/16205620287.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/gakixegijeludonevibewax.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/1452390513.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/58670773950.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/ledafuligolizenomoja.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///lesilijabija.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fqr1cr27sqnl3ek5rgmhh7s26s/tofatifumenovet.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/wefolovugexugafowurobe.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/bosukusinelabokute.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/mufojupolarufutotozu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/4206964390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=one+market+apkPDF 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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16132 bytes
SHA-256: 39f206b7c4ada2566c5ca0eccc5f0eb72fc30895b89e29f3320eafe9801135ce
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 10104 bytes
SHA-256: 8aef6b09e541e8cb01e479b2539a5b8cf47b2e034f887359ed73d6b6aa729b36