Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b801d938335df2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 19:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fc3e62cfa5b94f26ae2d8ead929b744 SHA-1: 76b1b0d58c79e27cc628d504f91731098e5d5f43 SHA-256: f3b801d938335df2e80b59cab45c326e10e0f3a213383b83c0cecea9d782125f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of external URIs and the link farm structure points towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--or3bo5mvlb.com/data/editor/file/sotopofire.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/bojirexokegodinum.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/dofikifulalesemafi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c362266f---59154555912.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/buzugupurukomina.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/55364597034.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/vuvir.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/joxizofakazazomuzev.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/bebikapox.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/27198053078.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/timamidawafavogenomuja.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/datixinawakekatemasati.pdfIn PDF document text
    • https://losungversorger.com/product/file/gurifaxawugegagop.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/79493541101.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/7040249265.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa479d1e0---vepoz.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/51880415501.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75588006257.pdfIn PDF document text
    • http://gazetavk.ru/img/file/morudononimutoxori.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/75380475638.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/81360942584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=trucos+de+gta+3+androidPDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 10736 bytes
SHA-256: 9cc90a7be27252a709a608b6007ed52f279ca47e7c550bcc078f4b1e6b23fa46
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17716 bytes
SHA-256: ce0c5a038fd5af9ee062ab4349e4b39dcace78fb88c9f35abf276968872e1013
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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