Malicious PDF — malware analysis report

Static analysis result for SHA-256 373a7fa966760435…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 01:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7eeee8584edf40e64f4ae643ead3de7 SHA-1: d5f604119e5f7a5737a30899de4bb3e7a800e8c2 SHA-256: 373a7fa96676043500398acd66c191e53176f769c913267dbe30e65c6ce499f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, likely serving as lures for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=xbox+controller+emulator+android PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613295284d752---juduxopog.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/47613987673.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/52439613646.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/3552394827.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/82127533717.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xekobomabojafida.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nubuwutabitorupajeroza.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/79bfe0800f5c317505eb69c053de3446/84913560427.pdfIn PDF document text
    • http://mcutech.net/files/79064616375.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///9697819447.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/binujawapo.pdfIn PDF document text
    • http://axwelindia.com/uploads/97107943277.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/rufewu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/temetewavobalalusuwep.pdfIn PDF document text
    • http://partnercable.hu/files/30271396838.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/foniz.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/josebuzanovepezuz.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21643336882.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/bomamogupimopume.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/25008229188.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/99318489115.pdfIn PDF document text
    • https://onlinendttraining.net/files/65820509472.pdfIn PDF document text
    • http://alkanboya.com/files/file///3790397377.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/48528707436.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wogafen.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 17716 bytes
SHA-256: 9a3b9928c781a2d2ed889b93f7d1ce8826d4bb744532211954e5edd18a0df343
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 10712 bytes
SHA-256: f8bc5dc1d25b8e3cd291deb1dca5aaf0acb8acbbdb2473806b25b62da478696d

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