Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c19b9e66d268700…

MALICIOUS

PDF

73.5 KB Created: 2020-12-18 23:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7de9b6043be9b96efe3027f712fa69cf SHA-1: b28e44254afa6bd10cdfee2ac82c0ef70d2d05b3 SHA-256: 0c19b9e66d268700d652d7e90402b2c449667ea139f4676621f1fe7efa5d4c7a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffmen.ru/strik?utm_term=littleroot+town+chords In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5fc497176819b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f8b141367014.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/geradonomerivom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5fdc05c0cce59.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/603a276b5f.pdfIn PDF document text
    • https://bonunobomatujo.weebly.com/uploads/1/3/4/3/134318799/wisazi.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/5948158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5fc880679c4ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc15c11ea4a794d564840ae/t/5fd1de98ce71ee580faccdb8/1607589533103/77800949341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f668c451-6eee-4cf0-83e1-7a70245a816a/fejera.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27e6e3398ff7515381371/t/5fc44a72cb3e0f5771d87143/1606699636150/right_hand_rule_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213705ed-bae0-40d2-811a-cac39368fb02/nuzabipisumobarufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f362b5-152b-44d3-8136-376b5efa5a2c/imvu_hack_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/1-10_in_french.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
    • 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_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 4848 bytes
SHA-256: 5a05b725a554c41b3777e92d21106b279eb57d9860ce8be626a52fbdcd0ed81f
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 11600 bytes
SHA-256: 1cebe93388e13badba3258435dddb84b98d6113757da3b29b4bfbfe8c744fc2c
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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