Malicious PDF — malware analysis report

Static analysis result for SHA-256 f615279ed873064f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 04:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d20eba3758e335d1b8615f5ebca0cfb SHA-1: e04050547af1efe9d061818237f7e4d1ca9a8080 SHA-256: f615279ed873064f1fd2060440f97a95de8543ddd6c189f49b9aabbd95edabcc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and multiple external URIs, with one heuristic indicating it's a link farm on disposable hosting. The primary attack pattern involves tricking users into clicking a link that likely leads to a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161414293c1e39---25415378231.pdf In PDF document text
    • http://woodlander.sk/grafika/file/gafofegoxakefi.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011435274374.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/sebubajela.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99412960729.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/vofutegekikiwojobofezor.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/12445745020.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/32206690325.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/23965320589.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/tesobinipudijoporololur.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wopotemu.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/92790359059.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/73733450678.pdfIn PDF document text
    • http://all-premium.com/user_file/files/57659828361.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27eb10d92c8dd76f8b4a0cb2e57f1385/22188954379.pdfIn PDF document text
    • https://zzhqhi.com/d/files/56102705473.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/13429836006.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/85057601331.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///vuwenozukofa.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/64713675954.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/bodakogadufumemonividovum.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/dafibefagivurepuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=srimad+vagbat+gita+in+bengali+pdfPDF 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_off0000afbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBC 14496 bytes
SHA-256: 6b9db4cdc8cdf119137a1c66cc905fb0fbd3ed24dc833e00acf3241628cba8bb
font_01_sfnt_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10832 bytes
SHA-256: 80b8328ddd95a866e22d4993ce811849f0ba452a68ffe08d45e10bca737bb606