Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3449e03fb9c69e6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 04:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96968b71a6b0c22056f855344ad88e7b SHA-1: 2fdcfce672759a380107244ae1430058817a9082 SHA-256: d3449e03fb9c69e6920e2fc6120d9290039985d65129861bff034de947f48386
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are likely intended to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://architettipassarinmarzotto.com/userfiles/files/kojodasilusekad.pdf In PDF document text
    • https://indicaperu.com/userfiles/file/89423689355.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/vexafewisafimesal.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • https://davnosti.ru/upload/pulugemudineguluganizuna.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/35966896616.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/84063523202.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133376d57848---22648875054.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/9058586759.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/wetaz.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/ginavuzumaguminofujok.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gatukebesinozavuleli.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/5302145378.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/jofuwowafevovefegesirupa.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bavetidepukaxobejaputul.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/22309490005.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kajosawenowaxegaza.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/66249791985.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/89884691387.pdfIn PDF document text
    • https://airxps.com/userfiles/files/rujimofexetapuvumekijon.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/90227946901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ftp+file+apkPDF 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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 16724 bytes
SHA-256: 06ec842c88f7e2d2a53d09d26f8b87ed05c8b72d87f1034232ceec1ab0c16d1a
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 9928 bytes
SHA-256: f9a41615d38daf11848794f2432d25d82a19899ec74c9a21e08fd82be6bf88f2
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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