Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cf944c55ebe567…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 22:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c60211e44042f4e0fb24317990bd026 SHA-1: 217084590a4b3acef1e605f9a2b94ea5c80e350b SHA-256: 06cf944c55ebe567b58904a304bf083bfde2aaffd796abf94da50be78e3c2f79
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and configured as a link farm, indicating a distribution or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.bufolari.com/public/immagini/file/63539357799.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/kojuwuwufudixukov.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/bexuxobebad.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vurarawajapadaluvalasapi.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/30278377161.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/nezidupevapekilikil.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/panizubafunewetaf.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/82784760761.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/8610586482.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kekeg.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-04-07-07-70.pdfIn PDF document text
    • http://silver1979.com/upload/file/23000106458.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/3260138414.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/posanid.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/jajoputixukudodufemoga.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/87431918743.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/wipimivogato.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f155b54263502f530c3730be10f1d856/fukiwubowofisokekal.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/88333106609.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/zuzuk.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/mavenametazabe.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/8017367138.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/eeulftpt3r9dqfqubmsftedga3/raboziwipulo.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/63881172483.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/vovatiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=naruto+shippuden+ep+324PDF 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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 18120 bytes
SHA-256: 57731cc5c5e470833fe1b1ead43079cae9e1c74dce78b7fdc70dbc2d1782520d
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10892 bytes
SHA-256: 2952c6a4ce75eebe0cf28dd9575b6a6c30a599bd4f2c16131ff1ad2580e14545