Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1b5d8b469350d0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 04:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59f7d1efb7a838bcf614bbcf87aa0664 SHA-1: 6430d31f7dfeed467e498f6ff83bda2fc5c964fb SHA-256: 9b1b5d8b469350d0ea851c31133ccd93c45855c4169d40401b3befd31d296be4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://archism.ru/uplcv?utm_term=pokemon+silver+3ds+cheats PDF link annotation
    • http://ttmplus.com/userfiles/files/75478587257.pdfIn PDF document text
    • http://eternoohydro.com/d/files/65877825928.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/tanurural.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/25684725882.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/surenuxer.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/19994131123.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/sobizegepibukewuji.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/14535431804.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ca586bbf---buwukavuredub.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/93265860209.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/4827980653.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/bowebosesulavofadedin.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/90100596980.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/xarolekimiwumuxoret.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vazidoritok.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28069273519.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/71116033138.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c9764b7209b8cb1f5586e36c6601e164/puremaliw.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/zewowofejenidaganej.pdfIn PDF document text
    • https://matrixx.lu/images/wikojoridazoses.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/18330859392.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/muradaxajelipijuletig.pdfIn PDF document text
    • http://santeh.md/img/files/53217457662.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/wejodit.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506440671.pdfIn PDF document text
    • http://secoinblock.com/upload/files/xipedefuzuxobolebetefi.pdfIn PDF document text
    • 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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 10964 bytes
SHA-256: fc9a10df22ae9fb34c03999ad6a92dc5e275af8ee41ae5eb46bfb208a61bba73
font_01_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 15100 bytes
SHA-256: d68fe55001e9ae4c30dca079a0a020c5a6debce5536d6ac139b4826068963a69