Malicious PDF — malware analysis report

Static analysis result for SHA-256 432900e3b5964665…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 14:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c94b7a76ae74ac37f7a4ab44a4bca121 SHA-1: fb9ae058079bbcd4c4300846ffa20e2344b33564 SHA-256: 432900e3b596466569907298f797da5553f5a179281764b124e2caadf474261f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, many pointing to potentially malicious domains, suggests a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is used to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://studiodispirito.it/userfiles/file/gebaruwamu.pdf In PDF document text
    • http://perseverance.cyou/updatefiles/file/juxunemojoleger.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/nuvodozovijazo.pdfIn PDF document text
    • http://panteres.com/files/files/65620212126.pdfIn PDF document text
    • http://orderkai.com/uploads/files/90309559655.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/debewanarilesibozij.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/benerijoxopexufilez.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ab907fd739f914e29d528fa65a7cf0b/51814185983.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/dijimolaxevopipew.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/2100744028.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/jaremadenevedasekilewom.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vemivukodupefojetepawel.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/61488019767.pdfIn PDF document text
    • http://salwex.hu/file/lezizuzes.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/62604927484.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/wuwaxigikapopivusawixun.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/29247904018.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/78693127387.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/73208600984.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131e25ebf07b---35174124856.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/17604555527.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wekupujetijanebuzawowabu.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/18466541399.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/63195139005.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/82133058215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+apk+modyPDF 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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 10764 bytes
SHA-256: cb7adbd84b4c83aea19b06e895aabe6fe904083fa97ec83df6ff2ee0379dfe02
font_01_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 15028 bytes
SHA-256: 6e922a3d3c1534cde7b6cd2d5e8c52833ec4ebb1451b1fcf83d19a31a4cd586b