Malicious PDF — malware analysis report

Static analysis result for SHA-256 923131fd4a3f4238…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 66a9671bd786154d2406f2efa64bb5fe SHA-1: 8e88c2561e1569a8d6d539d873db14f6c7d2c2d0 SHA-256: 923131fd4a3f42386596305f4a1fbc860a1cfff05e84c7b7ad4440878e223b04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://geojeoceanhotel.com/userfiles/file/20210909210528.pdf In PDF document text
    • https://svetplus.com/userfiles/files/xadolaliwagasipenizugumux.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/redagabisevuzuwozadob.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/ditofebosusamolagu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wufafefa.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/43727790578.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/67668705303.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/poxemufarepuvitovirodad.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/66337877051.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090114040673499.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/pimuxodaludotogebexolovi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jafuzulogarepunimovupup.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/29516167679.pdfIn PDF document text
    • http://airzo.net/userData/board/file/23489632617.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/varamogonuro.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nuxewad.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wivowolatojagurinomab.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4a1d95715bd8ff58f5b4c6782bdd796d/velusedulufanoxuzalevo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210906_2A5A1927D60E97E7.pdfIn PDF document text
    • http://www.depomatrial.com/file/raxuxulakibijek.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/99428022302.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/5745978484.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dapojotuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ukulele+christmas+songs+tab+pdfPDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11408 bytes
SHA-256: dd1a7664fc79a3a0924c9b7f6ef9c4a08ac36d1991d2e442f4a9e5d577c17e48
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 16596 bytes
SHA-256: 72bf4b2e423860c85272ac0a6c3f2a840d3fdaf37e70ba0149be0987b0da46e1