Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b8da1d67e4834b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-13 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a952848903aaced0d1703483bea2751 SHA-1: 3e271733123c6dbee4ee0e51fcea6d6c45bd77cd SHA-256: 74b8da1d67e4834b31dd9f24aed64188846f2ac52e64336a89270dc126b14aaa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of distinct hosts and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed061dba9---vazumaxefigojagopux.pdf In PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/50094359229.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/12975409343.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kavatoxizefetenodajesarim.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/mutidifakepodipivukoxifa.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/13375176355.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16da66a41---sisula.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/kiwofolazawozapo.pdfIn PDF document text
    • http://rts-3.ru/upload/files/98705899463.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/34674199899.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/90088261774.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/55157044737.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jasogodexaxoxekudatanosi.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/jefizefer.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53883533682.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/41141508521.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/poretiwaj.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/mafotuzuxoniwufivobiwipep.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/bodenazolo.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tulitaxukaxejekin.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/ladalojetidemos.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/49148279538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=skin+mod+apk+mlPDF 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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 10224 bytes
SHA-256: b1b764721c9450746756f95593c8607f0f2527ad2b77624e524c2370d3da087a
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 15140 bytes
SHA-256: 45cce9c66e9fb0f1fc41c5266aa080b5daa2b8b27cf342b08d4f6749ce74d193
font_02_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1