Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8590b3358bd50e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 18:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae425a12acfe7dab1b0393113c37a2e6 SHA-1: e75f333adc318327e6b77adf5c1751091790a463 SHA-256: 4e8590b3358bd50e20219b0742d164a55616802fb2602733ad4268dafe671952
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to multiple disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://kurumakaitori-one.com/js/upload/files/76600497346.pdf In PDF document text
    • http://kantoromega.pl/userfiles/file/binewusulelusitibuzuma.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zepapumatofokudulofu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nonovowe.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-01-44-27-11.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/39184620891.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/35843727587.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/zobivuserew.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905194706632854yjgc29xe3hal.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/miwoxasomopiro.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/16278367947.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62919854255.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/dewuto.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/suwalusez.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/48436998230.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/48415442645.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mezuxibu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zawewosuvetod.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wabuwadizowasimama.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea6a287d9---jidumarisipebejorepegutos.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wevosogudaxopegasatur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=calculus+and+differential+geometry+book+pdfPDF 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_off0000bd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 11440 bytes
SHA-256: 0186dcfa934e2301f6db8a139e80be292c99b33adbb66a8b5506f7dc6dac2cac
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 16592 bytes
SHA-256: e3df393f6d35ab7f8447e56594787d30594a7c6084e81189d43c21ecd24f5dc7

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