Malicious PDF — malware analysis report

Static analysis result for SHA-256 06de21f9042a5c18…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33f3fbb2be0968cbd3eb1e394859bc39 SHA-1: 3c86ea9396823deb9dd15edac97d2cd2db66a459 SHA-256: 06de21f9042a5c18ee8a7aff35ced6028c9df8eca8dbf89a9d9d430a3b9851cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic indicates it functions as a link farm. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest it is designed to lead the user to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=viu+premium+apk PDF link annotation
    • https://angkagenap.com/contents/files/kiwuxolopabegasad.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xajegotejowepokuf.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210905/210905133448709748dmxdnx3vtczf.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34134556073.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/6828901888.pdfIn PDF document text
    • https://stotex.rs/files/jijukunuzudozozedoxesap.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/limazujiwilajomud.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/47023590692.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wezubevudexagasofuta.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/menunuvudibebexagatanev.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/warigewajevo.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/rebid.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210915203231.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415bee4a0a3---20339483052.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/5176529338.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/bedujuka.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/11174698741.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/kakixol.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/83677977603.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/38843062116.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110753137603.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210917083117.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/6934526729.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/52141891898.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72786107563.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10036 bytes
SHA-256: 67b416ea96774504d1bb89fd1e1d9493f255399432889fe07f28f20ea1882280
font_02_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 17652 bytes
SHA-256: 7aadb20095b25e48d5dba7695a8e8c574dbaf41a9213f24fae48c965bf9afe7d