Malicious PDF — malware analysis report

Static analysis result for SHA-256 08affa30e3025e1b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 11:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3267520097c2e5c0b8e6a6e3f64480c0 SHA-1: 4ba96be208b2f2978395d8055babc223dc1d3c5e SHA-256: 08affa30e3025e1bcd1d3fcf3fea70ecd6a5ad74bde713d0bb52ab0b74b46e0c
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially disposable domains, which is a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may instruct users to open a password-protected archive, a technique used to bypass gateway security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=aplicacion+bloc+de+notas+para+android PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136800a8c193---temiwovuwikakubojekupego.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/zusuzezanikovok.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/pusubimaxamewezeda.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/58400508498.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/13998732700.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/75393476085.pdfIn PDF document text
    • https://123natura.com/stockages/files/78232119556.pdfIn PDF document text
    • http://mextro.de/upload/files/xusivufepatigiruvu.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jipusefusamev.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/903090f9a49359396bce5264e7753e53/70974895152.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/36613509308.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/pakakebowomikijejorowi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/zozedu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jutitaxaretebaze.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/dubutogu.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/20229032791.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/fojinudutewesuraxajoset.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/voworu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/wobagefiwujibulutuxovom.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dozenubebuxuzef.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/39479126090.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/puselaluvuxubavuno.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_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 17932 bytes
SHA-256: 8b677a12df989de45c904710f4a21283a2c315631816d95bdeca6b6520ae447c
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 10628 bytes
SHA-256: 9d2c72fc29173950d0e89fcd81468d98f2d0373b12d119f6ee874934ab1d574f