Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b19d7c25e7b48…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 16:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b68892bb2d3e7bfbbf0ea83b3ffd6981 SHA-1: dbacb1d36e90ed5914078bc8bc17ac33808ed33e SHA-256: fd8b19d7c25e7b48b14723b09693abc23551633fc13ceb1f866cb2a601723de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tivatijapan.com/uploads/userfiles/file/86699375674.pdf In PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/36201522890.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lisexaweg.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94089468772.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/poren.pdfIn PDF document text
    • http://sinostandards.net/upload/files/ratipimuj.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fq9tse7ti1hlh2k666tj4m0ovm/jifajijawagigoja.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405f0f41d9d---10851641479.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/namedebiguw.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/74509321849.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631587005xibidofozes.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/fojibebozamunotewe.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/zisopapevitomubatabisevos.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/dozakamebivanuz.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/getogar.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/44168565662.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xivusorezizolajonilej.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/zanugabuzuvusisa.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/69715037173.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/tupiritigetiwit.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/62655632894.pdfIn PDF document text
    • https://cargobull.cz/res/file/vufejonixuzagidipokapasik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=retro+classic+apkPDF 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://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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 17972 bytes
SHA-256: 884aa1926a570ede7a91ca77c6f8e6917064c90a0d35e735f1514570c9b6df34
font_01_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10400 bytes
SHA-256: 96801a1cba441539c97e81b1a630384718f7e83c769124db93b25294ad6a8e12
font_02_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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