Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9200ce6e22b5c5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 10:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75e31a1f2ebacbdec2860f7c894cf29c SHA-1: 7cb559d614ac32c43d490dfd8a7f864962fcc4af SHA-256: dd9200ce6e22b5c5409beb1f1538d03a7d8da509651a794c846016f0a25880e4
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. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true malicious destination.

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://inwebjor.ru/uplcv?utm_term=candy+crush+saga+android+cheats PDF link annotation
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddc828aa---33188213623.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pobaliwuvopalazepe.pdfIn PDF document text
    • https://asiapharma.la/files/files/rigezoxorawukemeguzinol.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905145505.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jufunoriro.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/livagixijolunifiwomufaja.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/73316299456.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/taxuroru.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/21274994951.pdfIn PDF document text
    • http://dsraxys.com/uploads/68611820820.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/maxokasijexazolejegozep.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/vesajixa.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/tenazalewelonib.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pinelatebaxowanakemutora.pdfIn PDF document text
    • http://runo34.ru/attachments/file/sofagutaputo.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/90474026165.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905232136.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zozapubuvuw.pdfIn PDF document text
    • http://dges.in/userfiles/file/5529853637.pdfIn PDF document text
    • http://cssh.es/img/file/51415961333.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/66736564830.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c6e716fb79ab4f618522acf05d5a3e4/7030037142.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_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17316 bytes
SHA-256: fed684b27259d5485e3875102c1f09ce85894d9426cc6de05dfdab35fa6ba122
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 10848 bytes
SHA-256: 326b422ef242dada158a4cf2f30272fe2c925dc22efda3ee86812a4e481d6b0c

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