Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa6b82271610ef4…

MALICIOUS

PDF

67.7 KB Created: 2021-09-14 00:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 893379bc1771666ed12678d94cc876b2 SHA-1: 9c8104061806e967d667e22e84c622de3dbc2c37 SHA-256: efa6b82271610ef45fe5486966f4fb60d66be74c8c589952b9693b4cd980280a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9108

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://machi-tomo.xyz/js/ckfinder/userfiles/files/vomamiluloj.pdf In PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/11262814934.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/46304450293.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-10/20210910145249406720.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/9458885993.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a12429e4ebf645b280d2c9b602931340/44623008205.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pupofoxuruvigowa.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xobalinurasagesokozig.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/leremulukujotejo.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/51900405056.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wigojopiga.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/28112099446.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/53209118887.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/loweneratumiwelafakipomul.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/volofujejovenodavuwa.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/94478278587.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/52759491986.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/97128370058.pdfIn PDF document text
    • http://alltechsro.cz/files/lujulewuvepujegijeji.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/1156260114.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://landtop.com/filespath/files/20210902200109.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87729781348.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/6604509878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fragmentation+in+android+examplePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 17972 bytes
SHA-256: f015b665ab68add4197fe0efc12660cb3a650a7fa2ac5509a31729af66dfe940

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