Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b42773c1f3bbad…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 11:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2048af8d8e810028872c04aa7ac67f4 SHA-1: 0524a745ae8cc847310416731cc6869f0609e177 SHA-256: 55b42773c1f3bbad3098c0fc70f5313b87c02d1b2e1b06154f684b79ebb33f33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous unknown URLs suggest an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://industrialsupplies.pk/userfiles/files/56548333481.pdf In PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nujutoxoruxikiwar.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630713509.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/disepezogiwokanodopixe.pdfIn PDF document text
    • http://rvhifi.cz/files/file/21179017504.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/mozipatufogegipedulegawu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/samuvifonumamokanaxu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/pobotix.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/sowamimewewojujumixuw.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zefegosemovajuxaruvuso.pdfIn PDF document text
    • http://artio.pl/files/files/daxopijinagezek.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/60406023506.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/futeguvajegobagi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6c547f1692b889f6081512173964af7e/13368809859.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fajese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+cut+video+on+android+phonePDF 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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10640 bytes
SHA-256: f271c144d218fd74fab0e04f7c48b402a70893eaa6e7e2fc90db3edc2e3c4c87
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 17620 bytes
SHA-256: 37dbe7a88905736ac384c70b7b302f75bf66b547805942fa930ddb42173a6493
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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