Malicious PDF — malware analysis report

Static analysis result for SHA-256 18029d848207e48d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 07:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2949942cf53baa7ab6f470a61c3dfb9 SHA-1: 8880a3c8e1f5f3eed126fb90f7c277989a060a3b SHA-256: 18029d848207e48de387bca181df72c34bb22da6a1d2e6b2495fbd27c43b9e1f
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 and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external, potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true destination or purpose through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=apk+decompiler+and+recompiler PDF link annotation
    • http://niezapominajkowo.eu/userfiles/file/xovosewezuxegasit.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/48848596029.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/45637411010.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/kodavibewuzotazagepobu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/zodarerad.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/bubazazisad.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbd93c5f5---lobefatuwirojuwoki.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zabesonumew.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xenuguseponoma.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nazepeb.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/60115166283.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/wugigugovabamesidoxo.pdfIn PDF document text
    • http://leeandrewdavison.com/download/69226331201.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090311221673499.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/16807999178.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/gazorajifojiminuxalaweges.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/44889659185.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409024a3322---50576753090.pdfIn PDF document text
    • http://asqcert.net/files/files/vugaripagizusajujoperazij.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pogorewun.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/42107454754.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_off0000bf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 18432 bytes
SHA-256: 7d7c5ae743d90067246b82a19b5eaafc7977ff87ee9cbc9afd3e0a585022d540
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10480 bytes
SHA-256: eafeba5cd02891674f18f5d9854379dd3070ac9ca0894c64d1af2525918815dd
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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