Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db1d28bcc46df17…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 17:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73cc34a495cc2eef2cad97b3e4b8e315 SHA-1: 3a314e5e4ba6e1c44e55b224925f802be57ac7b4 SHA-256: 9db1d28bcc46df1784e686872d94c4efd8660f26722459da491fcd5fcb4c479c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely intended to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=sites+that+show+live+football+matches PDF link annotation
    • http://parkety-patemal.sk/files/file/99791725200.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zibovonukotupada.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/31880670521.pdfIn PDF document text
    • http://imaginove.eu/data/Files/26059130434.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/71420090661.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nazipivufakovosematapurig.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/zirexigixoxaretesuperuwo.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/nuxaje.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/33433094136.pdfIn PDF document text
    • http://grupophi.es/uploads/files/25944198455.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mesutoseramixinaruna.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/japibiwaxekazegunivixe.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3917398963.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/76623328814.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c18cea450---gaxofolexusin.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb370a5dd---12224997452.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/foxefugatapirizu.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/mosowalepavulaluf.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/raborufitoniwaxujununud.pdfIn PDF document text
    • https://keongracun.org/contents/files/123693231.pdfIn PDF document text
    • http://elsped.hu/files/file/67370900265.pdfIn PDF document text
    • http://valeneighbors.com/userimages/revurolamogine.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/pawub.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/gesogulowogajolilikumaje.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51965519269.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/89314650420.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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 14868 bytes
SHA-256: 6832ca2cbf92eb763d657f5c199ba3b144aaecab7d3bf6bc830b5657ffe1d9d0
font_01_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10764 bytes
SHA-256: 1756609c9f57ad2fa4d64d73e25ec404bc06a4934bb84c2297578da9a812df90