Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba990cda9632230…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 13:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 012cc217c882e8656438a8f6e480e449 SHA-1: 931044b07fbafed1c68e8d7402002e07a92f91b3 SHA-256: 3ba990cda96322304e9107e1673e9e886ef6ba8a2ed5a806b3611b4f8e854fd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs point to numerous PDF files, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a 'Phishing.Trojan' strongly suggest malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bugaboo-buffalo.eu/UserFiles/File/19240981716.pdf In PDF document text
    • http://1000projects.ru/upload_picture/file/bajipazerib.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/41076663056.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/zopejetenuposutowagok.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/vuvaluvavedifaxoje.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/nubulerufep.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/movetumikaxetivemimuja.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pifike.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/38735367394.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/todixumoku.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/94974359143.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/boxaragopol.pdfIn PDF document text
    • http://roocenter.ru/upload/file/68627636784.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/58032620265.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/76752349150.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c56e7f7af---rizunomigobetebigupukopa.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/87133870186.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/bidow.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/20438804460.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/39646184063.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witamimitoti.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/zozopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=earn+free+steam+keysPDF 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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 10304 bytes
SHA-256: 2fa44f8a194a4dedebc893805718fe68e52d3a467a9f781dcead4691c93bc4a8
font_01_sfnt_off0000c6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17524 bytes
SHA-256: 7e502393a1213cbd317c9f572d7accf37d3f12353c45ea5bba69bf08224e49fa

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