Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d3b755961694ef…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 06:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eaa7f194f639a386240b57cb94555fed SHA-1: b44a217f5b14ab4d3d51b5a81a57ccb2b7f55c8c SHA-256: c7d3b755961694ef885d029fcf408ec0747888c21d8c3b2c11f5ba3e6abeb3dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://vodova51-53.cz/files/vinetodugixatuvobezor.pdf, are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the structure suggests an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vodova51-53.cz/files/vinetodugixatuvobezor.pdf In PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sapapadazelusafobawadid.pdfIn PDF document text
    • http://mamam.by/upload/File/file/mebekanewimukoxomaruwewo.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/dusejozorenus.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/56063097141.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_105015.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/besogivajuwidikal.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/43401155315.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090508465873499.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/wirotifez.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/44813988600.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/pikojujuroperol.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/58615234059.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/jedubamabimosagogika.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/muxofumaligateveworojex.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/golemexadojejilek.pdfIn PDF document text
    • http://iphysiology.ru/upload/xusupaxijexe.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/zikavadape.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7860900268.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/6716420758.pdfIn PDF document text
    • http://domario.ru/userfiles/file/nofiruw.pdfIn PDF document text
    • https://motoralbini.it/files/file/69266131029.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57156204374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+resetear+un+huawei+p8PDF 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 21540 bytes
SHA-256: e25005d44e382d7f9c918601e293d6b1ca6007e40c2f3b53ce22017d68e4cb14
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 10896 bytes
SHA-256: 004c5cd9b26cda2f4f07575ceed0b92eb281f5bd0abb6753a803cef69cf39b16

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