Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e932efd724263e…

MALICIOUS

PDF

67.7 KB Created: 2021-10-09 11:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b477946cea91fcfe44ad88e0ad51ea4a SHA-1: 52bbf0d8ae1d89be65fb5fb1f0fbf26485f42218 SHA-256: 92e932efd724263ef6f7bb91bfc9514a27d277516a4280f2ba2160f977531cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts to obscure the true malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=application+of+binomial+theorem+in+real+life PDF link annotation
    • http://balatonfurediallatorvos.hu/userfiles/file/latukekozoso.pdfIn PDF document text
    • http://melvin.cz/data/74129556587.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/52643923431.pdfIn PDF document text
    • http://xycrusher.com/d/files/jisabugibiwijame.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72249028961.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/42077964433.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/komogunamapuzidutawizom.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/duvarit.pdfIn PDF document text
    • https://gameclub.by/uploads/files/67933065686.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/rijurewunadawuwalo.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zixazukilofezivul.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/jixerere.pdfIn PDF document text
    • http://congluc.com/upload/files/nonorebiga.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/9209656901.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/53598757221.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/dogaxogo.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/65981139156.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bedem.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/848805215.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c855d86731e9eeeafa9fa66a612a2f74/nawijiwewekigewis.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161499f16d6dac---43338652533.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/61322734274.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_off0000ac93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC93 14460 bytes
SHA-256: c163fa8ba1339f1e1011ed29fd08e0b88d1d96149f3679fce921d843423d2949
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10696 bytes
SHA-256: 2cc18a88a0b1f6a99237cef8eaba76caddf313a114bb09eeb1a808c03c0c2162

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