Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae4e6d0471b33fe…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 06:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6887dd722beab4ac0ecc808fdee583e SHA-1: 272df9e871f9eb54c6649f672af458fcc33aa763 SHA-256: 5ae4e6d0471b33fe85390a0c45e89d9b2f7b9357f34e8dea458806f58db2ec16
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=comparative+anatomy+of+vertebrates+heart+pdf
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/1049707.pdf
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/203953.pdf
    • http://sadovik.me/43583574545wirpt.pdf
    • http://kismyketio.com/como_descargar_bendy_and_the_ink_machined5qbd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/06b24cbf-c47b-42af-a3b6-4f33cf683b5c/63261661001.pdf
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_44ba6ecfec6a4c499f12c601be56bfee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12e89356-ee4d-4160-9100-70e318bd579d/sundara_kandam_in_tamil_movie_download.pdf
    • https://s3.amazonaws.com/vuforewebub/tamas.pdf
    • https://s3.amazonaws.com/wulagisi/ramuju.pdf
    • https://s3.amazonaws.com/nefunupu/lulewefolemi.pdf
    • https://s3.amazonaws.com/polojuliragam/87197607867.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_dedbc17217514464a35c9b327d493ba8.pdf?index=true
    • https://s3.amazonaws.com/savukojubusum/dowulozofuwikepegu.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_a8f48f4da8e84b288d3beeefe4a0bcfe.pdf?index=true
    • https://s3.amazonaws.com/jinotugiwomo/regazixusi.pdf
    • https://s3.amazonaws.com/jifesu/rexejok.pdf
    • https://uploads.strikinglycdn.com/files/5d6d3477-2f2c-4ae5-ab7c-c5a48a0815e6/dunkin_donuts_tuna_salad_copycat_recipe.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_fd0fd729477f4ad888c575f9aeb411e7.pdf?index=true
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_275f10136f6a49d2b8e247b53fb36ce9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58b34f77-b2c3-4ae1-978c-21381f07b12a/38799749167.pdf
    • https://uploads.strikinglycdn.com/files/85fc9e9b-9425-499b-a497-bf0fb8550c4a/multiple_intelligences_activities_for_preschoolers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f7.bin
b4822cef91677aadd7d72ac3b7c941f8db4b82ff3e4cf40d23f1dec05c8627b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 5456 bytes
font_01_sfnt_off00010c5a.bin
afcb0b6871ad85876dce4e1c9fd15708dd3a8a1c384dd1a804fc63ff261c3246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 10568 bytes

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