Malicious PDF — malware analysis report

Static analysis result for SHA-256 766f1501d7747475…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 19:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4e0e389c4223fce954fc2110459ddd7 SHA-1: 471353265452ae34e60b2c6929831c403c631189 SHA-256: 766f1501d7747475722b69b705157e7cc009234a37977e745cdc9d0b9a184bad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1f85166aada6da46423edd1c59fa1295/xebejedosabajasigor.pdf In PDF document text
    • https://ww150005.linebot.net/upfile/files/20210911111925.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/25137071437.pdfIn PDF document text
    • http://clingac.com/d/files/49482617164.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kukajuravufawogutawofav.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/67616457867.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/diwiviresesofakub.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/86322780937.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/62327540930.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/kozafoxiwosadizi.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/dipibelaboni.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/98037321481.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/domugoliturukoro.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/81224596380.pdfIn PDF document text
    • https://birudongker.com/contents/files/roradodanasekubuxilili.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bebalufibabijin.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/24788019750.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/35561317100.pdfIn PDF document text
    • https://arerp.kr/data/file///6459706713.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/lizukazal.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/81366018911.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/nigelegosuvivufumatanu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zewezebudukujo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907123527435620.pdfIn PDF document text
    • https://duel.pl/userfiles/file/fenumiwajabokoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=google+docs+para+android+descargarPDF 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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 16296 bytes
SHA-256: 66f14ef66f5b1003f814a652cd283a859270fd7a4d31450b15bdf690882c36cf
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10628 bytes
SHA-256: 2c7c60da15c97eea17f52ecd0d94df23b5ee199db4bbe99cd757a0761923c426