Malicious PDF — malware analysis report

Static analysis result for SHA-256 48903954f5daf365…

MALICIOUS

PDF

92.9 KB Created: 2021-09-23 14:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3f9da9b16237974d6a9d8fd8044468a SHA-1: 1275b13df3e4dc69b0df4101a6d9a82e87d672da SHA-256: 48903954f5daf3657f8104d554b9d1efc018490fbe9ed13c6b149fc32f0cf798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://lexuspolymers.com/assets/ckfinder/userfiles/files/63997767380.pdf In PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30050290853.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/93460854849.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/69766120365.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/28170366302.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109201222490331.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/41426236420.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/jazodaxilikurumuxowiva.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/6791675041.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210918075017.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/gitefipadom.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/64326874998.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/kosoxo.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/44949371530.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614848593a2a6---61796175848.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/91754200572.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/zizawimalun.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/59552697837.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/wibol.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/53517629921.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gitotibakujaxawim.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/40695654418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+among+us+playPDF link annotation
    • 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://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_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 10596 bytes
SHA-256: d99054ddbdb83b9d2c7f16475a1b4256cd1444d34106560c38a9533e1e6e1ec1
font_01_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 18736 bytes
SHA-256: a068479cba7923bd6e8403e21b8d3dd7e7fdd580390dc04e62d38581658f9b34

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