Malicious PDF — malware analysis report

Static analysis result for SHA-256 e276208bc7e21a15…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aaf6d58d7a36fe2772d29f65cc2d3b84 SHA-1: 538fbbdde48ec6da41d349bb687ca4e38b58894a SHA-256: e276208bc7e21a15eab5973b6e21e87524e2cb7f8b3c0f9ebeb6d12fc660a930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=install+vola+sports PDF link annotation
    • http://slotkuda.com/contents/files/bobumukojenex.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630516463.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/54984352021.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kabikubamaputagikudowo.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/24680623853.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23600956777.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/48736938826.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/nujajifobozoperof.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/bigimupujus.pdfIn PDF document text
    • http://indexone.ru/upload/file/faditow.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/94796017004.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/vemejatogaranotiz.pdfIn PDF document text
    • http://creationart.hu/files/file/dodigitujenulubezax.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/64976708064.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/zuvevid.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/boredovijati.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/25926826033.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/85418756497.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/43509176922.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/fuwinuzerelakewozuvebezi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/buvawuvafez.pdfIn PDF document text
    • https://suksesunited.com/contents/files/52978210343.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b75dc2086---fumilutizarewizi.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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 17908 bytes
SHA-256: bffc39371f098c17cea390fc463b9941124c787e8912504cda14ac77b3e36e9e
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 10040 bytes
SHA-256: 5754d1ac0f55f04ab734c6dd3593ff08d9f5ba909daac9e54b7c760def7e45c6
font_02_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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