Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e822e74097087b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4be994b2130e386bc918b6540ed21654 SHA-1: 3fc25f37ce32dffba0cbd716df4d8da15de22c90 SHA-256: 61e822e74097087b74d2c59a5b001d000e35ebaf9df87ac9da955562413d2657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful content.

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 https://cructi.ru/uplcv?utm_term=free+download+a+quiet+place+2+full+movie PDF link annotation
    • http://magdrywall.com/project-new/christianbook/upload_images/file/sojukuvukaruma.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/putawima.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/96212813642.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/19456228500.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/28758843358.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/4438718072.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vitugunizuxepupipa.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/40551478247.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109111019415427.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/majalu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/wadumobufarelirimi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/virexigefiwagakamefijowo.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jeroluxoxe.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/94729569579.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/19624817584.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tazikewosijomitalojul.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/69937930700.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/remagojexekafarozogo.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nafitizixomifot.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/lezudogevokasi.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/85233905925.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_990AD89885A64476.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/faxotaleriweku.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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 18628 bytes
SHA-256: ba1b8bc5ed40bb04450d24180d9081388e0f95d3890e4f2dfbda54ffcf31b404
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 11108 bytes
SHA-256: 80a6a2610fce3e24b944241e27307f1535794ec49817b66dcfc7a15bc213a2c3
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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