Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525ba1e57c16ffb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 23:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f356e7ba7983760ce6237ef183274737 SHA-1: 3220305ea3ee9f1ea89b0a898cd0928f015c1c2d SHA-256: a525ba1e57c16ffb541d4c49308612cad22943ac16ff7112e1eecc510b180a74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent, likely to trick users into downloading malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://familiegravesen.dk/ckfinder/userfiles/files/nibefedafogufadip.pdf In PDF document text
    • https://behagi.eus/files/galeria/files/bowirobebaja.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gipuvipo.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/39924038834.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/44009516872.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/nipebibepumorazu.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zonulaxejewowufedowavo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fijofefewubopugo.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/pumudamuza.pdfIn PDF document text
    • https://zagi.hr/files/15252934325.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zinulifojosisisibodotun.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/pesalifudaretezu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/safokabadasobutegiwomev.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0cgujgamhgsk3krl9ep1rsfn71/51605272204.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/56016962504.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/muzarelope.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210906003220_7ug6wd.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c4ed9f294dadedee68f46d9a6fe55fc1/guxuzez.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/7024820539.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/nowuvowugajujujuz.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090913001073499.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/20482395835.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wevizopeso.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/23153535924.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/65908591254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+aladdin+2019+123PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10576 bytes
SHA-256: 4f012170a2d9f7d5f096a607ffa83902152155d9d355964a8b0617fd8329a2af
font_02_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 18584 bytes
SHA-256: e69f83cdfb079c53c7d93597ef41bcf6d0370f67166ff0effde415b9497dbeb1