Malicious PDF — malware analysis report

Static analysis result for SHA-256 5774ce8d640148fa…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 23:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 557430880225ee0a6a92d4bcf3b15747 SHA-1: 85a5b2ca1e144f32e670873a6f3eff686497f0be SHA-256: 5774ce8d640148faf66698684857d998005675be144d01d019ee2fb4bb53b395
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cyuanmei.com/userfiles/file/rafujesazawesiruxedige.pdf In PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/98597963067.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/walovubiturakifoxe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7e90ee9ca9878893afab655186c33f79/xutapumunivadizejuxeru.pdfIn PDF document text
    • http://gro-felix.si/uploads/noliri.pdfIn PDF document text
    • http://yjccnc.com/upload/files/lilininugomazeripaberose.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/87309470484.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/75201385415.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/18845606287.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/90662372567.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/98778554059.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sikofupuraxilesipipon.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/25250506129.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ketudasutitekasasupal.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/podavurixilojuxerupu.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/45208011901.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sowifidip.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/572ea859b35791a355fe8c6d4dd78bae/wuzixojifeki.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/29282595169.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/lulixetilaziromaxuxi.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/zeguxunasalupil.pdfIn PDF document text
    • https://33mobility.net/uploads/files/pisepozobedijogo.pdfIn PDF document text
    • http://freewest.at/natuzomewomefanepup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=things+that+should+be+in+minecraftPDF 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_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 11128 bytes
SHA-256: 6d30b98f0bbfd62758c88652635f778b8c609e6db30815b198a9cd65d0b2b2b9
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 17580 bytes
SHA-256: bf7500d3f49974460528740b0369d37417e4dfd5dc7b7f389d4c31f9716e0bcb
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1