Malicious PDF — malware analysis report

Static analysis result for SHA-256 5766183cbfb367d3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1baa5698b83a0e168c277f62b14ca79 SHA-1: f05e54de1ff2278ab059a36ec6c296e1a4f3f01a SHA-256: 5766183cbfb367d30faf18c7dff1a859a307abab6bddce32bba7cc462c5a7124
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a link farm designed to redirect users, likely to phishing sites or malware downloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trans-serwis.com/userfiles/file/vetaposu.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/gokifixusegusowux.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/nimubepikoro.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/34047230814.pdfIn PDF document text
    • http://rs-entp.com/upload/file/sujegazij.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72a584cbc---tawif.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/76801454388.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/57042508168.pdfIn PDF document text
    • http://zenkatsu.dk/files/pavamifawofogegenagevised.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/relamagomuj.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zagibetejijagewuzor.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161526e310093a---gepagidizezepadatilasaxo.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/69719828925.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/25756907460.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/47768669463.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/74970557949.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/96674105141.pdfIn PDF document text
    • http://flexa.cz/docs/file/ninixubulawepo.pdfIn PDF document text
    • http://sireny.net/share/files/9448406962.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/44205069638.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/birodufazisepugovex.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/takisemapolabumerav.pdfIn PDF document text
    • http://fitviewer.info/files/file/83561102547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sign+language+of+the+soul+pdfPDF 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_off0000add3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD3 10852 bytes
SHA-256: 6ad5ec199524a94e063d71107cae104fa17e9ccb6c0d22519ee230bb1c431f1f
font_01_sfnt_off0000c69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 16016 bytes
SHA-256: f1966b6e7479b885a4684427aadaf327b3284f90bcac387a1be9f1b940ce5be2
font_02_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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