Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f1232ef217830d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 07:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12555f16f5ae2a82b2aa66877bd0ab05 SHA-1: 72bb417d44fe5a4a7342c1e6b39c6c81a6450150 SHA-256: b0f1232ef217830d60931a8e9914792f64c9ead8b23bcdd68a3deecc4555a5b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured as link farms with UTM parameters, indicating a phishing or redirection attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=scos+spy+camera+apk+full PDF link annotation
    • http://songdolandmarkcity.com/userfiles/file/37831596389.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wovefise.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pofapipovawugi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zumafufegiliponopomezu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kodomesejebifeloxe.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/26665047648.pdfIn PDF document text
    • http://turnyras.lt/Files/file/11643664184.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109201303022720.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/60731326753.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wafabozusejupalufeno.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/23932235932.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210921160439.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/20632137244.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/98813617062.pdfIn PDF document text
    • http://rayanchem.com/d/files/23705999693.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/vibujezaxotoluvugomiv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fvgrei5rlhcbtgqk7co8m4sick/gasaxegajokuzagunuzerixa.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/nadejiluxiwijori.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/54905222628.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/19690891849.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/78432757751.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_off0000acdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 10728 bytes
SHA-256: 703424aa66a46ee1e88c80ba70c69fbc7197209201cb26fc6ccbbca1771146dc
font_02_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 18572 bytes
SHA-256: c1e545eb4cc8603e3f97f1399c7b3203b5252cf6552855fb7a8bab4d8abc34f5

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