Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc48b61fb92dc8f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 13:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f61ca47c2ed7acad3aea6cd4f0defa93 SHA-1: 5a53d8dd321c979df01bdb54a591e75d3f69724e SHA-256: 8bc48b61fb92dc8f18f6138250dde6d01512cd4f5615bef86b074305afbbde3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://100gastro.cz/soubory/files/megipixubepofizus.pdf In PDF document text
    • http://vangphutai.com/images/uploads/files/sowumaramude.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906110514.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/95121032316.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/xesapasoliniriz.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/40192608222.pdfIn PDF document text
    • https://drlanda.hu/user/file/91679011639.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/85999180168.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/77878742283.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/26459348637.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/90907229605.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/nisirewixuretewi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9386a91fd9732a36bd4163dc012088d0/xibutilanubaz.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/84996291133.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zekabolasapemidivivuron.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/nufenixowiwisegati.pdfIn PDF document text
    • http://ilkemymm.com/image/files/davezusalekinelar.pdfIn PDF document text
    • http://autonoleggioassereto.com/file/goneravojuxipelumilo.pdfIn PDF document text
    • http://195exim.com/datas/files/19880937899.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/mumebaxoxosokikowuva.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/44989052344.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/85238695955.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c704fa3439da300a1e40b1ce5841e965/ravipajazuji.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/dezazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unifi+plus+box+install+appsPDF 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_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 16348 bytes
SHA-256: 997ac9447d66c4173d65abf5886eab6e38229f471720e0889971df87d6a24f2f
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 10468 bytes
SHA-256: 7076edaf61eadf49b30d567abfb92eb7ead8b67729f22ff2347e588b157c0ab2

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