Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb47a5707ec874b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 08:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7aa51ec2a735e8060e618a825f2dc61e SHA-1: ed38204dedda6621bbf9ef92be01c3056918029f SHA-256: feb47a5707ec874b62cefd199344e555188536f7bd9129923458643313eea67c
184 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains embedded links to known malicious redirector infrastructure, specifically 'https://dafemum.ru/strik?utm_term=samsung+un40h5003afxza+wall+mount+screw+size', which is designed to lead users to potentially harmful content. The document also functions as a link farm on disposable hosting, indicating a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=samsung+un40h5003afxza+wall+mount+screw+size In PDF document text
    • http://toworugesolur.getenjoyment.net/69039891246.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/98117727299.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/read_books_online_free.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/bardo_thodol_espaol.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/how_to_facebook_message_recovery.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/32201967820.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/bedupapawazufupevukusefej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0a791e-3381-4a93-8324-cbe68ad67eb7/chief_boatswain_mate_pay_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06729ea6-0125-4018-8dcb-c0cad8ceee3f/59387855264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b063d178-0bb9-49fb-be75-e4d031e13662/67595141252.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/tabata_workout_video.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/baofeng_uv-_5r_vip_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/dagobojaxepebotetawis.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/44379793677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d1e9b0-9f29-4ca9-996c-00251f4a7f46/install_selenium_webdriver_python_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e30486d-eb2a-4581-965b-d1b88c8c71e9/how_to_sue_a_judge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48dacb83-9690-4b32-b5f7-1d5f3891099c/singer_4452_heavy_duty_sewing_machine_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f819b9-fb37-488b-a98a-6add8627d1d4/which_lollies_are_gluten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/accountant_experience_certificate_format.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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 6128 bytes
SHA-256: 0ca81fcc228c98028ce3a9f226e774fda8ab3a85e7e4707b592a094cc05e18a0
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 11116 bytes
SHA-256: e57723329324a06bbba3e4e137ba8dbe84dc0eddb513bf37ef55e3d3eff4ded5

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