Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb42dbba8fdf921…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a873cbb6556b2cbca7ddbed950ab288 SHA-1: 40c33c6871e5e05584a741790a03c0dee9450bd0 SHA-256: edb42dbba8fdf9217973262752eb2d8a1f39a51d423aa145558ae031509e7043
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://drafthe.ru/uplcv?utm_term=easy+scroll+automatic+scrolling+apk PDF link annotation
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632024033.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7cc251f0035714cfadcaec492382e27/tolawawexodele.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/woniligon.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/zokidolozomamox.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/86500040302.pdfIn PDF document text
    • https://seger.cz/userfiles/file/vosanogabukekamagozaribad.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/46655000351.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zixorada.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/95242894107.pdfIn PDF document text
    • http://blueyee.com/upload/file/110231554108.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/33319034422.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/xiwizilanubuponabogagipaf.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gamatazajomezimedefegekij.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/wimewarorojiralizefana.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/91362220253.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/vitelexotonizikavubapese.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/2588167817.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/8849407156.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/75931156145.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/xoguzevekuxariwifega.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e1022eac9ffc3aee1369e0c6eb97c5a5/95932420448.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/29281805268.pdfIn PDF document text
    • 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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 15968 bytes
SHA-256: 4b31fdc5542fe6511630367523d3a416af5cec0ba98119e24cc1083c0ab6693a
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10876 bytes
SHA-256: 10ae3b90a0c508caf04ce086e500e9c3435750c85a9e15f779a7abfe9b18b41e
font_02_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1