Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b584c95a1fe522…

MALICIOUS

PDF

78.1 KB Created: 2021-10-13 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cf419a85d758511762efe6b7cc2fb91c SHA-1: 81dc319f9ce25e2dbb9d3d16d1eeb8c58457f98c SHA-256: d7b584c95a1fe5229449af27d674ef8b6c8abc6d5b41774a87693b5a4aaba757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.orthovision-lublin.pl/ckfinder/userfiles/files/bitiwubavi.pdf In PDF document text
    • http://remaining-mc.de/userfiles/file/97636179105.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/19822431288.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/41257768868.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/15903629755.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/37905475866.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/dafaferomatedata.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/41786486256.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/81263584601.pdfIn PDF document text
    • https://megashina24.ru/files/files/39329804326.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/62904778835.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/xoxudidoxeponuvuvumenofil.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/bikebewaruwipitanenen.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/xoguvi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/botiluro.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/lofedemutodeg.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/vasusadovo.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/28335623103.pdfIn PDF document text
    • http://eqsport.nl/userfiles/file/fojufexulefazubano.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/serabalusakoza.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092713065373499.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/79464756538.pdfIn PDF document text
    • https://paperland.bg/uploads/file/35333576228.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/46615805068.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=60+minutes+sickle+cell+episodePDF 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_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 17296 bytes
SHA-256: b8752b1ad7e9703effbb4cbe60e6067d2052713b9b4d47cea49d6c860591d8d0
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 10796 bytes
SHA-256: bf0048ca97736c06592c1ecf3af78714db07d3061d0c57c835a29a5903fbdd22

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