Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb98e9b2b6422e96…

MALICIOUS

PDF

74.2 KB Created: 2020-12-14 16:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f20bbeb29dae2d9fd43cac3331ec962a SHA-1: 865c9a624fe58f99da712f0b04cf6f1f9f8b844a SHA-256: eb98e9b2b6422e9656ea51780214f07bd6df27a50181cd8f834493d2e865cb60
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of links suggests an attempt to lure the user to external, potentially harmful, sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=self+laminating+sheets+staples In PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/ce8c69da5.pdfIn PDF document text
    • https://dofukuligofevo.weebly.com/uploads/1/3/4/8/134869200/bepuwamotugoseg_niluroxowola_vanenerivefidi_wijojokex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498392/normal_5fc9b418f1696.pdfIn PDF document text
    • https://midoninojun.weebly.com/uploads/1/3/4/6/134665084/7b3352c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5fd2cf61cca87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5fcd009817856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f9a11041e0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fa711bfc0bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fc437ad0edd6.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/4930490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fce8a38b0cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/3098188530.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/mirinekikunufofawimibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9617da7a-8d45-471a-92ee-e7ef1f1cc205/ruger_gp100_grips_australia.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 5000 bytes
SHA-256: 5c3d68e524f86ccdaa44c35b766046f811d418e2d333bd782a8d52fef5a573a3
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10536 bytes
SHA-256: bca86f19fd125173b908042ccb4aa916da9566686208e2b2717007c76327701d
font_02_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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