Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eea8068d2bdd7b4…

MALICIOUS

PDF

76.3 KB Created: 2021-04-27 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bf478f5d2f93f755aab870f1891cc816 SHA-1: bbd9d797eb2ef2bdf55b3822d34b5b4c75f97962 SHA-256: 5eea8068d2bdd7b4e1d4b5e6ebcc1aecea45f1819cc0bbd69d27037475f09158
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO abuse. ClamAV and ML classifiers identified the PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=oklahoma+cdl+hazmat+study+guide PDF link annotation
    • http://kimidenexikox.getenjoyment.net/migawu.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/2141842.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/jesinogesoj.pdfIn PDF document text
    • http://wusator.mygamesonline.org/92256382025.pdfIn PDF document text
    • https://pozagawev.weebly.com/uploads/1/3/4/5/134580069/6e75ae86ba60db9.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/xuvorepaz_puzir_rijulusolegid_tekuxemovevilin.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/7517033.pdfIn PDF document text
    • https://delupizamima.weebly.com/uploads/1/3/4/5/134578079/4cc0a12.pdfIn PDF document text
    • https://babifufagisuku.weebly.com/uploads/1/3/4/6/134605010/wafixesivivag.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/kugijamafe_palakekelowuk.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/zebarufuridorur/10_steps_of_the_heros_journey_springboard.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_b80bef67fc1c4daea5f26f8fbc9ee824.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb10a89-d5ae-4bfb-a301-a9654773d0e1/manual_de_urbanidad_y_buenas_maneras_de_manuel_antonio_carreo_resumen.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_3cb61ee789e64bc29e2f1209febc8603.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_dc7623832e7f4ec69711aa295e5e29c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/edgenuity_dilations_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c3292f-a87e-4f6e-9bd6-387029b65bb7/first_alert_7010bsla_chirping.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/wejusirubexopivefa.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/business_environment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373c74c5-0572-4930-b8cb-3f2be844e7a4/tazatotivo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/appointment_letter_format_for_structural_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07738f0-09f7-4224-a3d3-b6ff67b7c2f4/what_is_meaning_of_tajweed.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_10b5bfc29c72475d841fc7075e6156b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/how_to_prepare_for_internship_interview_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9167853-74e1-4034-b04a-319047abad62/1451773667.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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 5500 bytes
SHA-256: ec45984e84d826036c3e7ab08399da367e84c9bf36e48ec15e7e650a67595cf9
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 11176 bytes
SHA-256: 03b408ed56a569a091ec52eb607e586151b5788585aa71f6c05b95c73ffd081c