Malicious PDF — malware analysis report

Static analysis result for SHA-256 897ebdda53ab09d4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 07:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63a67cf957f8985cf8f15b3342848497 SHA-1: 9bd96ec4f69a313aa03b628075db7dd9e11c1e4c SHA-256: 897ebdda53ab09d408675c627838d683d0315d787211ef7b10e1391d2194ae20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URIs, identified as a link farm on disposable hosting, suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=fifa+mobile+mod+apk+offline PDF link annotation
    • http://huseyindurmuslar.com/images_upload/files/39967468320.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/70069248031.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peretakulosasa.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/jepupu.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/2810653779.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/ronovoso.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/25213732021.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/94655103530.pdfIn PDF document text
    • http://www.perlodrink.com/documents/libevajebowepuf.pdfIn PDF document text
    • http://robbes.nl/media/files/xobolazubosajogupodaras.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/33896493997.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/59739417229.pdfIn PDF document text
    • https://razredna-nastava.net/files/86228847334.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/mivamomab.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/72213704089.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/42096152975.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/regidem.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210917_171326.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jedapavepejalafuboneku.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadisoradazarupofizok.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/jokanilotetezovi.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bolumunizubefasezibo.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/durogapuzer.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_off0000b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 10500 bytes
SHA-256: e5e966f5c941f205b8a2ea23bf085113b3cdc458d22db1fb6e4afd1db1600ed5
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 18276 bytes
SHA-256: 7ce8d32ee97c5815116122fee37b3c9b22df1c19970b976eb10ff32e63a5a629
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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