Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1556a7938c67cef…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 10:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e79bb0fd13f47eee7d84be4ea0e0e78a SHA-1: 44d42c37a05a94f63c644c46b904785046614be8 SHA-256: e1556a7938c67cefd099be3080cff2fb153bbd5df95537d4d027a21f89d093ca
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous external URIs, with one pointing to a raw IP address, suggesting it acts as a link farm or redirection service. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the overall structure and URI findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irrisyst.eu/files/file/vovibab.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/75128706298.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/keranamomusaw.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/tamulememonogimebezap.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/raresunekegigasikifid.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/59587330840.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/69087338304.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xanutaligolaj.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/90382186281.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/78105705548.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/71288631805.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/dagasedusiwerideze.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/genulolofukujem.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/kl73gc8i2gc0246sqgdkrmbmt6/9126879322.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/funinikedipufe.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/18645594039.pdfPDF link annotation
    • http://mascotdd.com/file_media/file_image/file/72573934555.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/peluzekiwagokabolekosuti.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907051259.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e7a2e4c3---kazakeganefipofamekefibit.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/derusaxerarotatekiso.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/41544739514.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/duxowubatowaxunupevegobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+game+of+2021+androidPDF link annotation
    • 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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 11000 bytes
SHA-256: 8348f51b62db2360e77f0b03ce2106ab8e518e8918d1d21b906fe132b03b9e1d
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 17284 bytes
SHA-256: ed894725d4855f5c727a27f1f5db1c48f9f6ecfdbe3fd4350767074364e8d531
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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