Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c366f486f537d3a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3eb4617d0237c96c6ce8dcda5dbc0e58 SHA-1: d90edcf6edd6770b6549f5c4b58dcb82a4235889 SHA-256: 0c366f486f537d3a8fac371fd27783dfafd0103b825d5a32f98fe820c9515d1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://lysfyyy.com/upload/files/20700346409.pdf In PDF document text
    • https://mklaassen.nl/images/file/jipojapurafekezeder.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/wefewofatetipiremifa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f870bdc754---lajugitime.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/69212426663.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/32887622714.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/64338236140.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/rexato.pdfIn PDF document text
    • http://schokofontaenen.de/idata/84237153597.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sibesuxejoxuduwizonujires.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/3645627360.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/59773394456.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/92632921051.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/54332536340.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/45696111882.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092123380773499.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/73329628703.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/jijuxagupanavazeto.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/38928569862.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24674413698.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210917215034514.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/seresomiwaduzugevuwiw.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/wixodimonunakezuz.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/35827017825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=example+of+beneficial+arthropodsPDF 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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 11112 bytes
SHA-256: 104dbe649ff01188aa57e8b171a0d8945cffefc628550c023c5cd12134dd9dbe
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 18160 bytes
SHA-256: f7c232fa098d118a5486f39a326324b92f8595c52aa5f572ce31b839c97984d1

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