Malicious PDF — malware analysis report

Static analysis result for SHA-256 7525cf7912cd7a6e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 02:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c54a763a4967e962cca44e5a2a4fc60 SHA-1: 3a448e6cba26b382114d110ffe53fc6381bae088 SHA-256: 7525cf7912cd7a6e9a196797035f750e10c4f2813474481b62cc4a4b6d20cea5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+photo+recovery+software+android PDF link annotation
    • http://sziszolg.hu/editor_up/vafaroburevewelala.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-18/20210918104451689153.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146190297d68---60367333225.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/35270100201.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/5727232639.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/75291517582.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rafesarut.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jq2spk6uv3off07ucmtfhdn48r/bosevakugub.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/binar.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37756823967.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/pelafepibidaxikop.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/44660173372.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lawejogino.pdfIn PDF document text
    • https://bursac.net/userfiles/file/23858544316.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/46086360563.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/90417759084.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/buropefobukapis.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/65918324243.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/56454874927.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6592775095.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wupugajikorisuzuxebulo.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/56541382746.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/ruwejugugugipekupedupupi.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/tazewogidi.pdfIn PDF document text
    • http://reylab.com/userfiles/file/bitazigaji.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_off0000c1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E4 10912 bytes
SHA-256: cee643e38bcacd17a8d83fd8110976670006fca954f703d527fc1effb13e6cea
font_01_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16816 bytes
SHA-256: 18923afc9c05111a4f0d56811811f968836f03d3fd2f31ec7abf2a8a81293c80
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1