Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2253f018deb0626…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 14:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 842238ae729ac4e0da282a37d3c6fba1 SHA-1: 53bf185dbdeefd8f30c903dbf858a630ae368da7 SHA-256: d2253f018deb062616d69fdd0f73b3a20b7da3faad5da9bfb0252493a5fecea2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=team+fortress+2+android PDF link annotation
    • http://es-manzokudou.com/yamituki-n/uploads/files/tipesolanetonutunupi.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/85721855264.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b819e466b7---dorugadijogelam.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328bce0796c---japalizolipiko.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zifowajeni.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109181156298990.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/45903368609.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/jopolubakabu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091609103973499.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/37264589963.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66909818294.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/73268410146.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/1530138297.pdfIn PDF document text
    • http://benetalent.com/upload/files/16408714194.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/93422656790.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/44709039894.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gijerotefejatefulesamaj.pdfIn PDF document text
    • http://zerosquareonline.com/file/99933586749.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kafidibatolurise.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/tifixexejijotadetev.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lemamusuxezimuzu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rujokopudepedapinuv.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_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 19324 bytes
SHA-256: 9dd22429e2cdef3131b0cf99fafff13481b967dcf949f75a1d081d9b419f4ffe
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 10552 bytes
SHA-256: 8b21df94c9cae088f52ae2f313dd5cb20c42963fedc228effa18c92bebc98fcd

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