Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b366ded85541eb1…

MALICIOUS

PDF

74.0 KB Created: 2021-04-23 00:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2f75231250c7829c1bf3c6e7776f73fb SHA-1: 220f2aa5b17e3a6b53e7a745cf60028fed503d46 SHA-256: 1b366ded85541eb1c5a9112b82192adf2525bb47bfac58edcb52588ac20b97b4
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF being flagged as a phishing trojan. The presence of suspicious URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://lozipotod.ru/strik?utm_term=sports+hd+dv+1080p+h.264+full+hd+firmware PDF link annotation
    • http://austritkfa.com/treaty_of_guadalupe_hidalgo_text9u3oo.pdfIn PDF document text
    • https://wewejemaviga.weebly.com/uploads/1/3/4/2/134235466/tudewavuz-sovoz-xiduvekesi-jomusebizutuxum.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/208597a.pdfIn PDF document text
    • http://molotkov.site/fenunirikca2y.pdfIn PDF document text
    • http://daliadiago.com/what_is_the_income_limit_to_receive_medicaid_in_michiganaktgv.pdfIn PDF document text
    • http://burrrhey.tech/call_of_cthulhu_7e_keeper_rulebook_p8nn82.pdfIn PDF document text
    • http://it50off.pro/29000598631xjdck.pdfIn PDF document text
    • http://insta-sale.site/dejatujigxxss.pdfIn PDF document text
    • http://groby-ritual.online/a_concise_introduction_to_world_religions_4th_edition_freekbmls.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/ridunop8vgqv.pdfIn PDF document text
    • http://bossyonlinex.com/35617344489uhc74.pdfIn PDF document text
    • http://social-whisper.ru/12338540652ow0xv.pdfIn PDF document text
    • http://souve.me/599306416473btu1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://natomilalusirof.rf.gd/how_to_connect_my_canon_ts3122_printer_to_my_computer.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_391668a423b846de881f3102ef91e4d3.pdf?index=trueIn PDF document text
    • http://xepolowamozuxan.rf.gd/shark_press_and_refresh_user_manual.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_8a16d6ffbd28480d9c2142a5fe32f8ed.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_b3263cf6ef6a40799cc0dbbe96684049.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_28c0fa1d608c46778bcdcd25232b2af6.pdf?index=trueIn PDF document text
    • http://guzeberipavol.rf.gd/photo_cutting_app_free.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_7da9160a6a3849a28ade162d3e001bf5.pdf?index=trueIn PDF document text
    • http://kubunixa.epizy.com/danemisopawaxamoderidu.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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 6108 bytes
SHA-256: f35df4aa1c888a3d911cd15fcf4426ed32a7a9889c45eecd8aae65f93719c512
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 11668 bytes
SHA-256: b0bd8c74bd4020fb0448ad5e7e68b6ec0a65325c70baa80c1cf7dcbc4f4bed2c
font_02_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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