Malicious PDF — malware analysis report

Static analysis result for SHA-256 051580ad155bb199…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 13:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b24dadaff6f48b8e71c3ea5994260624 SHA-1: 25cd9168e985878469a308ae1a3acddbe9aa5da0 SHA-256: 051580ad155bb199d385f52a2138aa8a8ec33908baeb6cf196584b1fc7b17f85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mlsy.cz/images/file/files/dovagutuguz.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287e37963---foxubomikex.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/fepujaxikevowutapubena.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/dozoladalanib.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dakusuxezerikibaruzuwite.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/lutorowudut.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/gufikotezelolajat.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/lalisotosoju.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/gogetewulumigipexowasa.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nijirisaxosodugobalu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/62117c38cb2b76dac7b3f809ae6e138f/23737467436.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92459323953.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/74821754085.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/87636945493.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630640592.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/33826023805.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99316411743.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/50365078792.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wenuwezibowokuga.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/8171528492.pdfIn PDF document text
    • http://zmiz.hr/userfiles/file/tesodovosubavur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tyson+vs+jones+stream+freePDF 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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 17996 bytes
SHA-256: 73ff27cb1232fb11b9866717d67c64974a1f12c96a6c0c4128c706de7dc1a627
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 10508 bytes
SHA-256: bcc10efd939e9d5f7e504257a0bece4a6fd14b32d9608933c006fb2fdc091642