Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c58d3d6c71197…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 15:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec4ea29c1631633416977c1fcac13317 SHA-1: 8953e3f9c7d01e352417affabdb3337bc7160544 SHA-256: 1f6c58d3d6c711970c8421effdd4bc04b40e1ea78e4d2e00192d75f14996e21d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53747639682.pdf In PDF document text
    • https://nurdagihaber.com/resimler/files/nosed.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/nokiwofa.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/36539253956.pdfIn PDF document text
    • http://midel.me/userfiles/file/ramogajosowixik.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/49543663883.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6cec1a437---84546109574.pdfIn PDF document text
    • http://czyxchem.com/upload/files/lajofakumutifo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905112648.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikekopegojewedav.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/58193241622.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/4556515238.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/zovijojukajevomuvegikazi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/jufepovenu.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/13051615703.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/69961388823.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/dafaviwiwitimixutejo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908150750363329.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/90836012418.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/50459539402.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/86914123800.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/livajokosurobasade.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/76907665197.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/7126168938.pdfIn PDF document text
    • https://e-room.co/userfiles/file/39159906494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=coc+hack+unlimited+allPDF 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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 10592 bytes
SHA-256: 9fb72585d7ce0c23beddacd9095b6a6f86965024662f733bb40f365132fc148b
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 15700 bytes
SHA-256: 95f247afef05e5d40f07675889528519ed7ab01562664d103677912a6f8ccfab