Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4bf48a27db89ec…

MALICIOUS

PDF

96.1 KB Created: 2021-09-14 23:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 411a26b0ab267b489a4cdc6fea5addfb SHA-1: a2833b0832b676debece8f3110baab8ea0800f34 SHA-256: 4f4bf48a27db89ec5b6d197e6f82e00ef25cddf8ab1d9950776deb7a4fbe568f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=suicide+squad+full+movie+movierulz PDF link annotation
    • http://saveursetsavoirs.fr/image/file/69144768883.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/terexefowekug.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/34080428376.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/voravazag.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/dijutojuliramuba.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/84126722471.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/dofimuruboda.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904132249.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/jidakomuwewaxama.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/66885787708.pdfIn PDF document text
    • http://rentaruedas.com/files/others/lokagenuboronepexojiwepol.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63203225440.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109050828106849.pdfIn PDF document text
    • https://synersys.fr/contenu/file/nunumofapuwe.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/61089360403.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/98985036348.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/28661438815.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/zopegasibotadafuk.pdfIn PDF document text
    • http://www.bash.cl/media/file/pigejulilipavonuvunuz.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pelawobewolawof.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/7126903765.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_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 19056 bytes
SHA-256: aa0056f6f1dad02c7a85a8319edb8b0ce4bb195341b675c7deed120466adc3ae
font_01_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 10884 bytes
SHA-256: 59e59fe8564e807612c7aa60da180725702185eceb0b099dcd599aad9647a285
font_02_sfnt_off00015a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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