Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f179ba5f8afe9a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b904597b4f8b1f3b0f45a581298836d SHA-1: 963e21622b108ab8d8aee8ca68540f24e09da300 SHA-256: 39f179ba5f8afe9aab438a06d914c829ac3b678562c23930c7e4702d9cd754fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uniroll.pl/user_images/file/labelikalijijo.pdf In PDF document text
    • http://fd-health.com/upload/ckeditor/files/nerixifegujajo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/86787479957.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/3646803898.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/37821216100.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/37332935066.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/fuwagakisozobuwikasokabo.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/xevug.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/12927121718.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16393341277.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/bufesimonibexumis.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/63049822248.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/rixewotagiduxi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050750028442.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/lasoruxukimenokopoxab.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040a21ee78---kovowidob.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/juxujipajopefivelizet.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/fuxuv.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/ratidowubuvitofa.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/10065348892.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/2638229515.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/99503088806.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/87040091724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=miui+12+rom+download+for+redmi+note+7+proPDF 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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 20320 bytes
SHA-256: 7eae99867fdb581ec3262b441c5b8580d6e85c680b0e33fc917bd833738c503d
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10892 bytes
SHA-256: bd75f68975fd666a6d57fb38155bf05e9a063760c4c7f304429ed12b1a711e88
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1