Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5ab84eb52671b1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 23:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3235683da4825edcf0067c715162fc4 SHA-1: 1ac43429a589219c2c6f3ce3b0a949808beadc32 SHA-256: 2b5ab84eb52671b1be2f1a9eb629b748f2e00a0e3196593a0275883a4448c206
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and URL distribution point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kogupenusuvopimexatire.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613319d8796ea---tenipugop.pdfIn PDF document text
    • http://manu-transport.com/documents/file/lonofebenekit.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/34120098148.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/70195296326.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jisekevadifit.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/supafa.pdfIn PDF document text
    • http://prompol.com/media/file/zunebipodetepixidi.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/fexovituxagabatibewonevi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/mapanerexirezidi.pdfIn PDF document text
    • http://tid.vn/upload/files/viraluzafuwomipuranubaxe.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/rurebokawadogijebe.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/98017153795.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/powifewuzavakageguw.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/tademojifeg.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/68312946313.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/36484071713.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327ec59f1f3---luninixe.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/kebaxujijisiziwexeza.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/33981554013.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/9899952256.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/84409987152.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/werutefadajuwi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/99269361820.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210831221227.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020106214626.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/48742908811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2k20+redeem+codesPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 17324 bytes
SHA-256: fc658da1101ecbfd5031733156e889e014d5f084395933d20a0e56f55bd1f95f
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10268 bytes
SHA-256: 804dedc4507dc3262f8054416a5f573aa97ed7e84fec3e5f4e59f43cb3d461e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1