Malicious PDF — malware analysis report

Static analysis result for SHA-256 35916f5ee95ae096…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 03:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 61e7dbffc48f547afc9f6e070d1abc99 SHA-1: 9fd0e818d44f946c314e98e1d1a418c507d03c2a SHA-256: 35916f5ee95ae096a17606b07c6c3df0406af54c7e7c3d3fd042956c3eb574a2
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The embedded URL 'https://zajinet.ru/123?utm_term=capture+the+flag+3d+movie' is presented as a lure for a "capture the flag 3d movie", suggesting a phishing or social engineering attempt. ML and ClamAV detections confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/123?utm_term=capture+the+flag+3d+movie PDF link annotation
    • http://dimopun.mywebcommunity.org/admin_manager_resume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602025f306351.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/63276603500.pdfIn PDF document text
    • http://gevejune.iblogger.org/history_of_western_philosophy_terjemahan_bahasa_indonesia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601dd1289c0bf.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/6d27f6c1-da27-4ed8-9555-757b7b3ceb83/lukadofoxamo.pdfIn PDF document text
    • http://tukakuze.epizy.com/lituketolufejimilidurad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745bf5f3-d321-43c9-a3ac-655c1209dd71/how_to_triage_a_patient.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/46336429842.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/wafiwukugajurevigofav.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/active_directory_windows_server_2020_tutorial.pdfIn PDF document text
    • http://tosememab.rf.gd/93632816070.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/fila_disruptor_2_womens_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e579528-0e0a-4601-82e5-559e475f5a89/the_mysterious_benedict_society.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/shakira_la_tortura_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276c62eb-5b25-4669-8597-d7cd56cecb31/79014563506.pdfIn PDF document text
    • http://gobonelore.epizy.com/cours_d_orthographe_grammaticale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9f0a53-ecf3-428d-84ba-ad90c3e8d784/how_to_get_ripped_with_trx.pdfIn PDF document text
    • http://jokilezitewoj.epizy.com/39859476565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411f3b8f-c678-42d0-af48-b6d85bae68f2/72657135693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17589ed-f513-4267-9f0d-dafa4c4ca350/keribujivezovemugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7005bf-4d89-4f1f-b782-8d619a5feaef/44214082530.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/gipad.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 5408 bytes
SHA-256: 7fb4842038cbc4a5a656b72203ccb1a53f471cb560fd12088139988ba66041f5
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10748 bytes
SHA-256: 25795bd4b3ddd4a7f3885f5d2b1a9d5494ef1607223073421040157405378c2d

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