Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ea6cc525bd8ec…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 00:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bd1045f072d41c13bac4ebd26d29189c SHA-1: ea3b04be89e2f58517fd5472995616f93ab18666 SHA-256: d61ea6cc525bd8ec44fb0a6944e7f9cd81b1fdf81e4def8ca60173d78cfdeeb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://venkateshservices.com/uploads/85432887494.pdf In PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/93001600031.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/79635750997.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210923151847.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/kipubevasefujaju.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/givotawijem.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/22650224422.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35423338211.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kivadepira.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161427f840d5b3---wepejagilepowadigosizid.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lipuvivusomewu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gekaxukutetuj.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/sidoremigemovelog.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/41760081802.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202193354311090.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/70134669018.pdfIn PDF document text
    • https://semut73.com/contents/files/19933115022.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/18973042626.pdfIn PDF document text
    • http://hk-keber.de/images/file/28033647862.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/kepimejajek.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/vekevuxa.pdfIn PDF document text
    • https://n-tlg.com/files/file/51020402062.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lotifanevuzaxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=real+racing+3+sizePDF 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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 10464 bytes
SHA-256: 243d1c8daef817ee3d09d8024210a399c844471b4cff8773a9254ece0b1987de
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 17600 bytes
SHA-256: 186c4d666b9b856d3e30f091eb62b3d34abaf363ca1133bbdcddefd00e451e07
font_02_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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