Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d3775f3f7cda22…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 14:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb8e03c850afc3f2b143302bd0169846 SHA-1: f554c42b01883f5f8e083a67418c6c7dc98f2829 SHA-256: c9d3775f3f7cda22d2c7b9d095c1c862920c07448b536ce21812114c5271a5c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and configured as link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://smidgel.ru/uplcv?utm_term=can+android+block+text+messages PDF link annotation
    • http://casaatlantida.com/userfiles/file///80114572124.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/11081087336.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/4177459926.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/pojipubogewuwutoxijum.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/liwipewuzor.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ca8b3038---terufoxojatu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e49b93aa9---detupufadasujene.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/65525332028.pdfIn PDF document text
    • https://vpmemorial.net/images/file/negusugupizivadajawotikek.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/67372480302.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/sizemukide.pdfIn PDF document text
    • https://trainova.com/userfiles/file/50219202401.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/81277715162.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/16087743870.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/79764915617.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xonagapefibakufalif.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/36807271754.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/kidepenegetovejafenoge.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/29535783119.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/48066482568.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/birez.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/niravakaduwexif.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_off0000afeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 11076 bytes
SHA-256: f4664173e33e7ffebb283af0c3318ca93830d35a9f76559176ba94a85bcdaf78
font_02_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 16432 bytes
SHA-256: c6eb26f1f728306835b77c8e8ed0a734a105001dfabbbeb9e0fc4b50d662e1c7

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