Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc11011de1cba053…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 03:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13ba91276b872b20f41a509e4918602a SHA-1: 726bfcf44e516511d8c7553255827e085e259885 SHA-256: dc11011de1cba053602210512aa939764328782e886849053298aa03a58c639e
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or spam campaign. The PDF structure and embedded links point towards an attempt to direct users to potentially malicious websites.

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 https://chcial.ru/uplcv?utm_term=padmaja+book+of+pharmacology+pdf PDF link annotation
    • http://devison-matras.ru/upload/file/4125470448.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/67678490906.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/51873273839.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/64612379208.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/nizof.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161457e1cd0e47---zudefetigadupisisis.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wadigisutifumiligur.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/15253457374.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210919022651.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/6927177453.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/61050044761.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/wanopixatete.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jawatonalulodu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/filidifaxufenovitepike.pdfIn PDF document text
    • https://norservis.info/files/files/72762202324.pdfIn PDF document text
    • http://pbpharm.com/upload/files/11357176559.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/91638577321.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/68753272542.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8921c512c53902f31b8366e57c03cfef/mosiji.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/58916223025.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902074710805174.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 10952 bytes
SHA-256: 8bafe0135a9a650d57b1fd7cf8a75821ef71ffcb3447632093695dfc8bc72197
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 17440 bytes
SHA-256: 5b3cc3bd45939627dfb2bfd968b6f14a7c51038b26f37ec51840bdee11ecc6a8

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