Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1484ddb2517d6d2…

MALICIOUS

PDF

97.6 KB Created: 2020-11-26 04:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fbd5acb4938abafd5e81afe2466c410b SHA-1: 05c7f99f0388c97e8d7b16e8f9e94e492055c327 SHA-256: a1484ddb2517d6d24f90d1757109dbf1432509a68d8396156fb035437b66567f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, including one to 'trafffe.ru', suggesting a phishing or link-farming attempt. The presence of embedded PDF streams and font data, along with the 'wkhtmltopdf' authoring application, indicates a potentially crafted document designed to exploit PDF vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/123?utm_term=religion+in+malaysia+percentage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fabfe8a23f6e.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/zojojekipagu.pdfIn PDF document text
    • https://pebenari.weebly.com/uploads/1/3/4/5/134518206/manezibix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fb9281395d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8e2f2cb4533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda84a95-5a61-49f3-bedb-fbde100cc0d9/16008770184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc074b8-eced-4ed8-b54b-485aea4b7277/paragon_hfs_for_windows_10_serial_ke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c3d31c-d70a-48dc-af37-b6d1da54a91a/xiviguxubesapifugufan.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/81564472430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198c8dfa-b456-49b9-b253-fef5f9309bc6/taxafi.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/kyle_xy_temporada_3_castellano.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015032.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15032 23360 bytes
SHA-256: eaf89951353eda7d2a503e9e2254758aa3d891bf204c7122c2baefb65caa6796
font_00_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 5360 bytes
SHA-256: 22bbe22036da68be86df07438d1924743863919d8e81c568f1b19adc24e97a22
font_01_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 10940 bytes
SHA-256: 65f7a88416fb55cf1ddc6d47a2a35b6aff9455625aed4d55a7033e4b7fdae455

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