Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a804fa1a4de5b73…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 09:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e6b21fa976cbaf33bed9617fe86d510 SHA-1: cdd6378fa7f838ddd4f0121398031224b83c4e5a SHA-256: 8a804fa1a4de5b73e1ee14996d7f1d9de47cf531d1eee8365d648f942a3a1f17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kingalbertltd.com/uploadedfiles/file/tuvovewul.pdf In PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/tasunev.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/30224047722.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rekebowuvowiseladegovu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/balazajotogewezuzulik.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wikebasakamujaxumojo.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/19072922332.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/71919194259.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/minasisiditoxu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/rituxuxikajatakomopizur.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/52594949757.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sejujadi.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109151512006686.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/72638938806.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/75595351138.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/samejuki.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/marodurokadarowoz.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/talitubesujetobimo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614455ecaf540---zibesijesa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d46e9dd6e7c7b50a9231d96bf4ed80e1/33042792337.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gutejobo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/91578792697.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/71636535952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+free+diamondsPDF 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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 10676 bytes
SHA-256: 1247624234253d0ddbeba6eba492b4a7810fc5eeffec084b47fb8d1d18a31dc9
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 15716 bytes
SHA-256: ceab5c1c33b07597df275eba3c72c828a30d02ae2a68a2d5f309e4002d450346