Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7301311641817b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 16:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdbb69a8418840da498ac4a628e2bd47 SHA-1: 06bf86ef129859fd2b1f20e65aad8326fb2b27a9 SHA-256: 4c7301311641817bf25199f810316d53fc3e1659f264291ac78563a65932a43e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external URLs, many of which appear to be link farms on disposable hosting, strongly suggests a phishing or redirection attack. The primary purpose seems to be to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=extreme+car+apk+mod PDF link annotation
    • https://aep-tc.com/cache/fck_files/file/85382253116.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/29114203532.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/20300405587.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/79035863844.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lskj7olt3ufpjvpsbcbmp5etb/34020596580.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/95547263258.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dusuduxemof.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43476873513.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/wumujosozoxiwebudisubuk.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/53365021066.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/46763299299.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/21709913453.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/51058488857.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/79356062728.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vinelugufonumaz.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/68170409798.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/77465448381.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/57577244345.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/motijanezetozuxi.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/kowepexaxamiwanavulupeso.pdfIn PDF document text
    • https://norservis.info/files/files/31611191903.pdfIn PDF document text
    • http://kezmosas.hu/files/file/72759177326.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vinorul.pdfIn PDF document text
    • 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_off0000c63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 10444 bytes
SHA-256: eb54e8b8fd6b845a09334f7f0392322f9f83fde099ddcfb2cd10cd30c2c9055f
font_01_sfnt_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 17676 bytes
SHA-256: 0739c6458d2f88c1929c8f59ebead0a781b95c74462effb480afa48726220d36
font_02_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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