Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1cdfe48d607d83…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 19:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da654fdf8e04ba1dc8047d2f0a788cab SHA-1: bda1b67fe2d6cc8e3fc8ebdc8f970106674aafd8 SHA-256: da1cdfe48d607d8343b5965e866ce9382d14a271011c22489f67e91c937fb958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=how+to+undo+deleted+pictures+on+android PDF link annotation
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/7367029343.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/tukoxumawilizanub.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e4bad249587e248233e604c20a1ff8b5/gasanapuvogotepavam.pdfIn PDF document text
    • http://reopen911.info/media/file/xinurelomonopud.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/25053719628.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16637476361.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/14145130666.pdfIn PDF document text
    • http://irths.com/upload_files/files/16591032076.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/fofogorizinuweredotid.pdfIn PDF document text
    • http://nemochem.cn/upload/files/8416584136.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/90746905042.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6c57e476---wisosamuwotukoxobe.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/donaxemituporabetajabinet.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/mevubikelifiketivasa.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/87112658352.pdfIn PDF document text
    • http://co-mit.com/uploads/files/23406581086.pdfIn PDF document text
    • http://cartopack.be/Images/file/81949971559.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pamawedagunet.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pubuxegoxusubarusowu.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210912_0026EA491C3C3834.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/juruderababotulilubuw.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/50518788004.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210907123210.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zigib.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631234860.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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 18152 bytes
SHA-256: 320ed22efdcb2623695311086e844eadf263dbba2162ed1447678ed29d696c5f
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 10684 bytes
SHA-256: f1036be49c9f0b67bf07c49b6d3298632190301d9e9f2ec1f321119be9b40601
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1