Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06d422a6b5e9e0c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 18:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cdf31db1823dcf7d31308fb064858416 SHA-1: 0948f70d56fb053f57925d4126ac4210b99910ac SHA-256: b06d422a6b5e9e0c04d5a196cf88e296904e5b3012b2d911af8df4d4902b1e87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=my+name+cake+pic PDF link annotation
    • http://zitalogeloluwiw.mygamesonline.org/28477777163.pdfIn PDF document text
    • http://nakozek.mypressonline.com/nadina.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/nizow_robokubidike_texapizepez.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/recommendation_letter_sample_for_student.pdfIn PDF document text
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/satasuv-kavajenaxivovol-xamuparopezuvum-danudujuvob.pdfIn PDF document text
    • https://nuzosobife.weebly.com/uploads/1/3/4/7/134734795/zovulasikabopugevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff77ff21b101.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/42196.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/29393844962.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/feruzevivefupiginijekirob.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/pdf_pluralisme_agama.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/fosaxuluj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_604497c63a90e.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/wefadep/meal_planner_template_with_macros.pdfIn PDF document text
    • http://kijonag.onlinewebshop.net/common_core_kindergarten_math_worksheets.pdfIn PDF document text
    • http://xonolori.atwebpages.com/musaxokapanubakadomume.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/how_do_i_study_for_the_property_and_casualty_insurance_exam.pdfIn PDF document text
    • http://baxewape.myartsonline.com/50476614749.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/bastards_of_istanbul.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 4944 bytes
SHA-256: b31d82f7594f255b1d57d273fb4a0a6f9fdcd02535638ab01e15711087429970
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10832 bytes
SHA-256: f442c5e725f9cc6a810beaba2b5dc5f9fed03d96f95cc250b0fe34ad9b5ce814