Malicious PDF — malware analysis report

Static analysis result for SHA-256 d376d5c8277e5be6…

MALICIOUS

PDF

107.4 KB Created: 2021-03-05 12:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 36e1ae816a92370266afb9bf72098211 SHA-1: 183dfde580cf92d4dd42279e9e8877a72810aa5e SHA-256: d376d5c8277e5be6b7e34796f18b152978ea12bc97b9e1c3a84bb6408fbf5f2d
126 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm designed to redirect users to malicious sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM firing. The primary URL, https://xezojetit.ru/strik?utm_term=divine+comedy+in+hindi+pdf+download, is presented as a download link for a PDF, but analysis suggests it leads to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

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://xezojetit.ru/strik?utm_term=divine+comedy+in+hindi+pdf+download PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/17897368050.pdfIn PDF document text
    • http://bigomipami.22web.org/m_audio_fast_track_ultra_8r_driver_windows_7_64.pdfIn PDF document text
    • http://testvvd.xyz/starbucks_color_changing_cold_cups_2019bmj40.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/zezupawizejululupidegerej.pdfIn PDF document text
    • http://uorott.com/kamurebawakiwomuzijuxamegne95b.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/7930370442.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/how_much_is_a_battery_for_a_ford_focus_diesel.pdfIn PDF document text
    • http://dalkomis.website/vizabidusufeveninasuje78g.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/87aa57f3-1241-4c21-bb90-400a1dc9b8a7/fotulazulolabojalijezej.pdfIn PDF document text
    • http://jorunodup.rf.gd/wazutimibufinopujizaw.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_77f0d047a649405da8ab3d488768c08f.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/wamagefobaluj.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_03d97db107da4f8d92d044fa2c0971ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3306007a-dcd5-459d-8883-7f8a55812087/49817169513.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_01d5d21a495546509321e52127158bcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5cfacd-c7e9-4347-8c61-0a3b99ee1a21/lorujefibatupibagazajaxim.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/dokegojirapefedu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15817 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off00016298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16298 5372 bytes
SHA-256: 809825c7f82aa0bb08ace4f8ad88632b34a267784785fc075e4c39bf24666c60
font_02_sfnt_off000174e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E2 12656 bytes
SHA-256: c58da6945fa503bc9df4a2970782e60e698086874521c92578dd39770ce7bfb1

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