Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025b87eb2059e89…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 18:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6adc0c87359627a3d2169ece5965da90 SHA-1: af24db9f25c085672f2134ba0328fd3a7ef69ba4 SHA-256: 4025b87eb2059e8944f15df07eec0da65fad45263e50daf3a775bdcca4ac941a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+head+unit+torque+pro PDF link annotation
    • http://oreoltour.ru/sites/default/files/file/kakafujuxikawamew.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161436037b2a59---wavekuz.pdfIn PDF document text
    • http://a-pluset.com/userfiles/32914249853.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/5677982238.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dumekituxidi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/10850481204.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/milapa.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/vusofevifizulufilukelak.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/daxedoxukegutatug.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/ribimepowop.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/61051643720.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vubexinemewezirisitufe.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/23870401239.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/79905100358.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/57941140072.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/risuvirozi.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/gotupotubijateje.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/batifonezidokogowupagi.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/tativovuzepegafital.pdfIn PDF document text
    • https://pmms-online.com/assets/file/44705224391.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/tusererebawiwetigedoz.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/wajobesagozanaxufasu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/76906496470.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109070034287217.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/86109190969.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10500 bytes
SHA-256: 5cee7cea8caab1fafab7f0bf7118a3a8af39f0118d944b0ae3317960a8764593
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16744 bytes
SHA-256: b36fed26055befb136d76001f4576ee1c203be69f93a69c472a08cb8d1a1fe6b
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1