Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0edf3a8078a3f8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 01:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43a9219e62b811ac1d43a0c9337d9598 SHA-1: f6c2d6887452cdbbb92668fb873b280876dcb8c2 SHA-256: aa0edf3a8078a3f8b06674dc703a798a71a6e80dbbb4f6e44b23144e0f812b1b
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links to external PDF files, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://uforoi.com/app/webroot/uploads/files/jerupizusemapu.pdf In PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xujapufezezubilipovirun.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/lamixuditopufifetumefonem.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/negogonotafevitagujow.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/33403091894.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/labeputosuvenukut.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83263303470.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/lanonoxa.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/3019964317.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/26919818340.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3d1b4055---kaxaz.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/fejurogigusugekowuze.pdfIn PDF document text
    • http://fitviewer.biz/files/file/puwaxogigenele.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///rozetebafexatigi.pdfIn PDF document text
    • https://atlantidegattico.it/file/2804278353.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb225acec0---puvuxuli.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/letozugugupijefafitoloz.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/41582862640.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/2427895102.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/14040959061.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46825950901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+exit+activity+programmaticallyPDF 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_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 18828 bytes
SHA-256: e1bf1fa52405aaee93bf19bc374eab95e1833c31cf41a9dd6aec76bb40fa6406
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10952 bytes
SHA-256: 703c0de5692491a2d3ea7e8e139b5613db6e146bb9dce5d9fef1cbc2cba3dbf7
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1