Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d601bb2efc678c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 12:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcd34d1ffdb2d65ba9c1141bc4c1259b SHA-1: c38f217af38043a43b9d5af26624a7c4be9b80b1 SHA-256: 39d601bb2efc678c03c0a780422808fbec0a1cc703db7a4b62e4a4f1d6a9681e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with one specifically pointing to a URL containing 'apk youtube premium cracked', suggesting a lure for potentially malicious software. The PDF's structure and the presence of many external links indicate it functions as a link farm or phishing document, likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=apk+youtube+premium+cracked PDF link annotation
    • https://riosemarescentrodemergulho.com/ckfinder/files/25431365842.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/turef.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210918155753_40oumf.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/81002025419.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/15482302301.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pezonotesewodikiro.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/44140378896.pdfIn PDF document text
    • http://skolky.info/foto/images/file/72624977756.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/desolirujugugazufunudis.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wobukut.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/91544263673.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xebabuke.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/75334992391.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuxetoxotudiza.pdfIn PDF document text
    • https://akconta.com/uploads/files/sogawuwop.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/52333032414.pdfIn PDF document text
    • https://wasael.com/userfiles/file/zinuwirijuwimezemaremi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/tosox.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/28655941299.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f8345f73---vulodowegelamopobikobujel.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/46011875216.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kobisonapixonuvaxonogaxag.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_off0000b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 10784 bytes
SHA-256: 5737b638ff2a1c61916fecc9cf632a64d07f80d87da2035f1a2a82a987e74e35
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16632 bytes
SHA-256: 7d24eade9ffab2c1c8597d7fea567d6dabc9e49740cbc35e53064f9bc33d90b9
font_02_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1