Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4d57a750b5b6a7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 18:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a13f0c0d4305c2f81617e66d0df3be52 SHA-1: ccf493dac7870ec88c035c0808b1051298823d75 SHA-256: ff4d57a750b5b6a7b3737946698ec76da6cd4c2db4f040b0ee6c723840532a64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary function is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=clashtasia+base+layout+apk PDF link annotation
    • http://hasdeu.md/data/userfiles/files/mosusodilivinewisuluvuxap.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/nodibalevakimazuv.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lujalaleriledesopi.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/9809799132.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/senimurojasoxavopedalupur.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/lenabaxujubogedarajoluvu.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/turatapetidupavofobu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/julolowaliniw.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/45590697348.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/31772751606.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/33020705728.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/jazemidujakufupifupila.pdfIn PDF document text
    • http://gapp.fr/medias/files/dozupirikuvimopali.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/lagetapupubulaluge.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/mozugopabe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dipumutefeduwigewivi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/704b3f0add0e8758dc62d871c81b6bcc/lazurinamofifega.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/wolakezufametosop.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xuledofijemaladirufekiga.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/42164588384.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/3483861427.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/nuzexebafojatemi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/bezexowuw.pdfIn PDF document text
    • 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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 10624 bytes
SHA-256: 2126c4375024d1be9ca6491a27c2c1b8f3c65b11b2728cf9e665d80693fb29d7
font_02_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16832 bytes
SHA-256: 1d103a328e46d0625fea22d052fd330b0c8d1888477c7c8aac8b30ba44d85ee0

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