Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d896c3f841a43e…

MALICIOUS

PDF

78.7 KB Created: 2021-01-21 17:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 596aff6aadb5f08620e73ef220914481 SHA-1: 15a45e4cde92cc9003acb8def955732c7cff8419 SHA-256: 69d896c3f841a43eaa9e80c346927c86810d8d8105ff3f343dbbff18c9f45ba2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to 'bologen.ru', which is flagged as a link farm and likely used for phishing or distributing further malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'physical activity questionnaire', aligning with phishing tactics.

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
  • 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://bologen.ru/123?utm_term=minnesota+leisure+time+physical+activity+questionnaire+en+espa%25C3%25B1ol PDF link annotation
    • https://site-1245124.mozfiles.com/files/1245124/saint_gobain_gyproc_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/digubamot/Pjbjh1o/botigod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_5fb53f318fe52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fad76524dfd8.pdfIn PDF document text
    • https://divevuke.weebly.com/uploads/1/3/3/9/133999966/sevowakeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f9350b0e0c0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fc56a6d98389.pdfIn PDF document text
    • https://site-1197190.mozfiles.com/files/1197190/kaththi_hd_1080p_video_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/ciaWAB2/anger_management_books_amazon.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/vupoxivu_nituxel.pdfIn PDF document text
    • https://wexopusipomela.weebly.com/uploads/1/3/5/3/135313487/74411b4f35cc.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/9oqyHjA/randal_s_monday_pc_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fc3a095a2864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/health_risk_assessment_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/dormouse_facts_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/challan_form_federal_public_service_commission.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5680 bytes
SHA-256: fd32db9fbec319325fea991d339ff29a3667f0070a8e20398fcb0100b7c44b86
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 12636 bytes
SHA-256: 770be3d3d67158f291c3e3d5291d234ac9356f6e5eb3f7a9954f44320bb02eca

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