Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c59d6fc7b133fa…

MALICIOUS

PDF

82.0 KB Created: 2021-10-25 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d93310e385256a279dac20c622d7179 SHA-1: 7a3737dad819f52f0fec8fe295f79d9865243ec6 SHA-256: f7c59d6fc7b133fa6e7b1706a2de7696cfdd8435ded8e646b62de0ab5bab26af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external websites, many of which are structured as link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

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://huntic.ru/uplcv?utm_term=small+letter+of+f PDF link annotation
    • http://zechnerbau.at/images/content/files/sunikiw.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bc0afe.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bixojajom.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/5177278030.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gatibokasufetagasofeson.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/ririgawuvoge.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/37982541750.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/25171226079.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wegekovekinul.pdfIn PDF document text
    • http://vhshf.de/File/pokivesakedi.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/441029229.pdfIn PDF document text
    • http://a899.net/userfiles/file/24772303148.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pekogagawaseseto.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/70583122817.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/32517761765.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/tibebojasomorigi.pdfIn PDF document text
    • http://rayanchem.com/d/files/47090489035.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sonixigadowikok.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/korafugipematotawoz.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/5653460127.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/nubazolekuwijiwupa.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/6837948526.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/68129974162.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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10084 bytes
SHA-256: 0a00b7161044a0bf68ed7072c8d250ec0724d46f2d1eb56564c21cbcde627f20
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 19344 bytes
SHA-256: d570f66e514a319f1d599d58c7b04b4578e4a736f5bb217a2a6843c25ef17e3a
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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