Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c5c27338da9820…

MALICIOUS

PDF

78.3 KB Created: 2021-03-12 04:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8664b22b96ae56141796d87d93d93cb2 SHA-1: 85b31427e3d394cf27d36d45cd997e7076870ed5 SHA-256: 79c5c27338da9820c515374b0f6b43a36d97b6c2ac19a29ede8007e05be92f80
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=beyond+bigger+leaner+stronger PDF link annotation
    • https://kokodukitibov.weebly.com/uploads/1/3/4/6/134609001/2457084.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/qghhbhf/mukotetu.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/6672250.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/3030429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_6010ad24dd8dc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ibUSjea/r-_type_dimensions_pc_descargar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604a769fe1f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5ff604d84d22d.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/pafexepigufiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_602c842179edf.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/sub_zero_fridge_for_sale_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/mMhfULD/best_voice_changer_software_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/sxijcif/pull_the_pinna_up_and_back.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/platero_y_yo_resumen_rincon_del_vago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_fabda1d9fd804ca3a14aa0e8bf9c9035.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_401cb58bf3d54854bc44cc09d9fed5f1.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_3aca24228b424d70a8645d07bae8784a.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_a99cd6f3c80a46da83f73746ee246be1.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_b138d20af7e142b095c3151d174c2e20.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_8e6e59767c0041379ebfa54ba923e558.pdf?index=trueIn 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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 5284 bytes
SHA-256: d8429050ef72d6b9de895ff55317373a32e0234af945982ba5a8be5eabd4d400
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10984 bytes
SHA-256: daa14234e0065404b407f65a0eac852d5af291eb9a3e7a3e337caf7e14945bca