Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb3991dc9f2b468…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 07:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 626c97f9e60b5ae683fe6a272b19c3eb SHA-1: 9b9c15c8531824362d1abf14cb588c9e995c2f1c SHA-256: 9eb3991dc9f2b46894cac173dbd0f06f02e30e4cfbfbb9642bf7f025d057306e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to disposable domains and are presented in a way that suggests a download. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://yokosohk.com/files/fckfiles/file/xuxogizuparekasazuk.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/lovofizurulosud.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/22842291155.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/57632418684.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/19608602237.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/93348894277.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/4170571741.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/27589029177.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_7B685B690F55E856.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/531488882.pdfIn PDF document text
    • http://gestioniarmatoriali.it/27003736022.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xanodaxeguwodikiwomafopon.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/fopovefofopamunaxax.pdfIn PDF document text
    • http://poorclarescork.ie/images/25328244838.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/sojavejasebogim.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/1206081314.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/68117487052.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0343d3481---buravuvufek.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/56248463554.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33ea68af---30201769810.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/suseworisejuwu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/8672207272.pdfIn PDF document text
    • http://balone.net/_upload/file///17716302324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+x+rom+dsPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 21864 bytes
SHA-256: 970d0fd1e3762d39de1c8ac096f4b8b8eb8ad957777453a99c4aa45ca819b4a0
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10208 bytes
SHA-256: a746c1b4bedd552849ed9814e7086e62279ff677b8590d48cc947b8d5e939c05