Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3e4d9b19f7a7b8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 01:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 468e2d9a2e65ac2c38d1f9e820fbd0a0 SHA-1: de02258f07c77561634f7a12479fb8a4bebc69de SHA-256: cd3e4d9b19f7a7b86a02d0b64e4e1647c909f3469960f0dc0fec67999c87c0d2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The numerous distinct hosts and disposable nature of the links indicate a campaign to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://northcoteplaza.com/userfiles/file/wamuboduto.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/36482767751.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/77401951582.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/roruxez.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/41263970856.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/lavelarikeluziwosovamexiv.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/muligisitopuw.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/25467252752.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/1456646834.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/weraresugagesun.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74612386794.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/77515975942.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/lopofizilan.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/derepixomodabevorawuze.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/94933167219.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/64945128947.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/tapelasemuvev.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/zazosonopazuzibaf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a57656a5---84451659388.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///wulilujitexasike.pdfIn PDF document text
    • http://momsystem.ru/public/file/93794364603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stop+ads+on+firestickPDF 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_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 10736 bytes
SHA-256: 1904364142732488c4ffe722fefc85927ca78347fc799ba2bceb340f01c15c24
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 17424 bytes
SHA-256: 430729a5e54a75f8a76a2c1006e52d739c1e5a985dac166a63321e3431a91bbd
font_02_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1