Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e170e1443ae1a4…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 18:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3f0058b74004260e9da121d0aff5b2d8 SHA-1: 2134e5c38129b3d764131c9698f9f56f98b2fff3 SHA-256: 30e170e1443ae1a4b845a3536d5d9666fcac8f79bcf435e9613701839bf7f6ea
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=american+temperament+test+society+dog+breeds PDF link annotation
    • http://losopefopamusoz.sportsontheweb.net/pals_algorithm_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_601fe1dfe140d.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/jiluvezevozubaxow.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/environment_and_ecology_book_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5fca3c699260e.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/9394850633.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/gate_2020_aptitude_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426812/normal_5feb4b58b1e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_354ee93f0d204964a86800664a52a580.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/translator_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710cb8a7-14d4-4157-b45f-9aa6ae7c44e0/why_will_my_gas_fireplace_not_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/busevef.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/ms_word_document_recovery_pane.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_9e7a410d7a37484fb1b72f7a3c6a9578.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_5ff3032901f840038fb698e7608d4336.pdf?index=trueIn PDF document text
    • http://xofiketur.rf.gd/9014603350.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/nupivojanidisip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b0961b-12ed-4c75-8d71-47c70f4f238b/xuvujaxumamatutemapom.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/android_programmatically_update_app.pdfIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_0aea8995b7614a3abaf22baf3b912a49.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_4aa2ea41ba274e2c896a7aab09582c71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc0b179-a7a4-439a-80f0-808b3c1d78a8/dedujidefolotedanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0b8aa8-264f-4cde-aba2-dba31553ab47/zubaxepavok.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_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 5592 bytes
SHA-256: 71b199e74f97420f1725a3692d5d498ad2dcbb4a5b042adcc4ee9a889705e422
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 10916 bytes
SHA-256: e53046729c68883870f7a36d43a3abcca4809e353b99040c33d2a04b050c1a69