Malicious PDF — malware analysis report

Static analysis result for SHA-256 389e1c63d6f6d93b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 16:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abbe3c2ff45d4e85285a02e80014df26 SHA-1: 92f09cedb91b2937a9a6b462ca9802872e6f7e85 SHA-256: 389e1c63d6f6d93b9faced58f6f0601e5d35fcd826f9d4e435878c0eb4e8a537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as link farms, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting a malicious intent to obscure the true destination. The presence of external URIs and the overall structure suggest the document is intended to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.tiande-global.com/ckfinder/userfiles/files/25720845415.pdf In PDF document text
    • http://levotst.com/uploads/files/44996478279.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/55616228771.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/peluvexalepiv.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zoxifunikov.pdfIn PDF document text
    • https://12waktu.com/contents/files/85798004178.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/rewirewag.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/17360706136.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nuzumonazidivulesogixuwi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5b3f8a8e7911cc8e62e297df70a4d50/23115365993.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/kivefomalimedosore.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/53678769012.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/bavexadavaguzaxirovep.pdfIn PDF document text
    • https://guijek.com/userfiles/file/54827325297.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/mejilujunegixuvojezuzope.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zukovabumuwivakavulomevug.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/megovajokixadosup.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/64884197792.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109032359338448.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/mojirasepar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+free+anime+apkPDF 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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 17184 bytes
SHA-256: 51811b28ccfb98548a03394c3f0040ccc20d21a1f424e173b2fe4844fda890c4
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10496 bytes
SHA-256: 4491138af3730f723c91cb4313864ed359c243fe21616259d5f84b51ee8c8156
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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