Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d4fda36fda6bd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 00:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42f9e36c60d31d95f4e5c829ec550646 SHA-1: 61d907a9753240c62afc79165f7a75f82b8d3bb2 SHA-256: 1b4d4fda36fda6bd7e44a3e4a747462025c281e30d1b002f280cb033c7a070ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ustunongel.com/image/files/43094929326.pdf In PDF document text
    • https://vleek.com/uploads/files/mefin.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19824687689.pdfIn PDF document text
    • https://europartner2.pl/uploads/losojo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/50751414337.pdfIn PDF document text
    • https://qkon.ca/images/file/31598601840.pdfIn PDF document text
    • https://brs.jo/userfiles/files/zofiwufo.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/6932135307.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a6b8831b---33270712111.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/36259956702.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-07/535d0d7b43ff143ab44689ffd026559e.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///86587978939.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/31490947327.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/31552741804.pdfIn PDF document text
    • https://actor-conseil.com/files/file/63197445719.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/72127319275.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/vewelakur.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/69480918281.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614312b6845c5---74298495170.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/rimodozipafinozuked.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/27335974424.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/66120437909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=outlook+exchange+server+settings+androidPDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17192 bytes
SHA-256: fc1d610439376b3b93b5c792a9cbb7be4f1f83b8d4ff3ad7dafa6e79f494ed10
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 11036 bytes
SHA-256: 1ed4035335622f5be936fa99c7892f73765b4c03a5d8122b36fdbae4256afe09

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