Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e90416507e81d5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ce7bbb02c7939767d24390ad06ffd04 SHA-1: 026cdb5f45770a0ab2d53b99541b4ad894e14bbc SHA-256: 48e90416507e81d56a4243f2fd40684c775ff0b42fa2779b6241d0cde0b7ba12
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to unknown domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/givabelabavowuko.pdf In PDF document text
    • https://sukaunited4d.vip/contents/files/jukifafidozulu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/sedazuwuloxime.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/lozogarenuviwexal.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_163123.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/72964504050.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50369059344.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/70110941568.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/56969002481.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xamazedukedogajejinatam.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mitakupamotegimoz.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/kasoxef.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55934413753.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/nubolixuzowilanak.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ds1gdqra8c6hvr42c0hnsiffa/73023617738.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/46158468221.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/01545c3f2713dc7d5bcac4c1fe25b75e/70614648465.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kamokaxobexakobupoloditi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/rivotefurejanu.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/28845701018.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/40174583649.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/buvupolifazebib.pdfIn PDF document text
    • http://quetthe.com/upload/files/karotavuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=123movies+watch+movies+onlinePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zipupabovijivefiginit.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://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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10796 bytes
SHA-256: 71930942cd5a1febcc783afb654cbde6ba88a90acd6eb20b9725309ea7036f5b
font_01_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 20360 bytes
SHA-256: a989e6bc890fa54adab27299eb0c0b52899dc530adace5d6fa83e0df25cdd9ad
font_02_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1