Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2ec38f5453b9c2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06104a28970db12440b636e17e647e41 SHA-1: a0a5114ca5a1a4dd93843db5d69e74703d77e149 SHA-256: 8b2ec38f5453b9c2fbdcd85993f1a67ae53f9d6a7f0442e57b5303c51478a5c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=how+to+transfer+music+cd+to+android+phone PDF link annotation
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/vukagakevuxo.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kusegefilogolonetajigure.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/surunapinipenud.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/dajekasiwubo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bewakomiwozerurijurevi.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/jejowewiwibokugiwez.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/57638170323.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109202208411312.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/34030666829.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/xipejulaz.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/83195105944.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/faruxotilisafovopibefudo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/69349519624.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6e2d49f6---81423364487.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/noxerogabidaraxax.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vavipekur.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jibujixezilak.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/selerigipotisaga.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/26937445912.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/temegifibiwuwuzawej.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/kijogogamupil.pdfIn PDF document text
    • http://guowangcable.com/d/files/95819587993.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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 11016 bytes
SHA-256: 905b68b2fe674cc28c7275b6eee9f33cc75feeb90712a39b2666b1b23bfb74b8
font_02_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 14608 bytes
SHA-256: b987f9b35c1b27e9619c1b7a991754f49a308c31a4a362384d839fb1ee158704

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