Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115aa338e860c2c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 15:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d75d86728669357a91e4b827b880404c SHA-1: abb3b9a0cb239a28f19758d0e929913e8ac8218c SHA-256: c115aa338e860c2cfca184c868e4536543b042564be13ec8c084453a99cfabd3
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 one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is likely used to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gowowdeli.com/uploads/files/donevafuwo.pdf In PDF document text
    • http://malbreil.com/userfiles/file/61661102897.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/paviwedamijevosukabixan.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/dilufiwunupugudipafam.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/sozigadamezidudavedupa.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jaxefabeliwojur.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/supad.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/loxijaterepobogagijomop.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161393318cbce2---tofiwusufemifivivet.pdfIn PDF document text
    • http://52963566.com/upload/file/202109061750426915.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • http://wenxuezj.com/images/File/50539006180.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nabevopekakinurekumo.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/42296322047.pdfIn PDF document text
    • http://ty-int.com/files/files/gikawonakokumulozapade.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/29294838407.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/tokufanusa.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/semaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=junooniyat+novel+by+maryam+complete+pdf+free+downloadPDF 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 16116 bytes
SHA-256: 3c7dc1428251fc714453557af874eb5af14144f6d90e062464aa45f6a3922424
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 11108 bytes
SHA-256: aaba3abd2abceb46cbee29fc5fcb9dad3e0dce540187ae7629dc6f0988614f96
font_02_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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