Malicious PDF — malware analysis report

Static analysis result for SHA-256 854511602f85f07b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 22:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58bc81c42d6869bf13ef44004a916915 SHA-1: e6a02c7feaa1f299fa8a2905df88e91c786a8676 SHA-256: 854511602f85f07b9d4a5314c2d2d935155728add9209cbc02a7b7649f79fae1
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. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://eastmangroupllc.net/ckfinder/userfiles/files/14327943580.pdf
    • http://longvu.vn/Images_upload/files/wivojozurid.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/97605193131.pdf
    • http://vekosgroup.ru/userfiles/file/vadarufokipixefowunutuw.pdf
    • http://urgentcarepb.net/userfiles/file/15902650327.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/86408715957.pdf
    • https://funbugs.ie/userfiles/file/78861810472.pdf
    • http://qtjdb.com/UploadFile/2021/09/14/file/20210914_163451_154.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_C4E28B0616411F36.pdf
    • https://zapret-rf.org/web/img/podborky/files/34820184274.pdf
    • https://adverto.ee/userfiles/file/86978681592.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/3210538730.pdf
    • https://soudurelausiere.ca/upload/editor/file/76031702411.pdf
    • http://modern-pro.ru/files/file/rufizifolijap.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a5080b7562e3cb22a6ca0f36e1898ca6/57083276952.pdf
    • http://abwalabamaave.com/uploads/files/xajud.pdf
    • http://salman-is.com/userfiles/file/20106661823.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/22544939128.pdf
    • http://imosa.asia/uploads/files/202109111525516358.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/2178524733.pdf
    • http://staropolski.net/Upload/file/masuzanuwadutob.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jorutorewupakalolunevofa.pdf
    • http://palaciodelosnavas.com/userfiles/file/61538709466.pdf
    • http://samuiluxurytravel.com/Uploads/file/7949932545.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shrimad+bhagwat+geeta+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b30b.bin
83a4f88308cf33c2b0f550109202f2af4e401ee029b350bd5f9bc010bcbdb4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 10828 bytes
font_01_sfnt_off0000cba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 16792 bytes
font_02_sfnt_off0000e3ba.bin
3c72cea4d3e4928c0e0c159c8746f9cbd2270105e1cf8d55ff290a57f384d501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 15280 bytes

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