Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f109fff84d6e5a6…

MALICIOUS

PDF

89.7 KB Created: 2021-01-18 12:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b6966be2099ba19b4134476d938c6f36 SHA-1: ed3313551d900715e3360af76943848d60457797 SHA-256: 3f109fff84d6e5a6c323cd949a357ede9ce76354fca4667c7b398f51809bcac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to exploit vulnerabilities or redirect users to malicious sites, potentially through embedded JavaScript or by exploiting PDF reader flaws.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/123?utm_term=circle+geometry+theorems+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fe725b1ca006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fef4dab1e6f6.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/jfjbihc/kopoduwitobebiga.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/reware.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fc569dda1f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/hfGjdij/mini_basketball_goal_academy.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/hoHLjgq/ark_ragnarok_deathworm_queen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotodur/85410501825.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/battlefield_1942_wake_island_multiplayer_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/maytag_bravos_quiet_series_300_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/oracle_academy_quiz_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/56032342169.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/science_experiment_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/pixukisuwokikuzukes.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/63830455621.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/rerozoxosanubabetubo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/cuddle_buddy_application_form_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/nice_guideline_hypertension_in_pregnancy_2019.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 5668 bytes
SHA-256: 14358eed92cb38108b3eeafd6ac3f5f4600919f3c1acc6b05f8977a4f657ce92
font_01_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 13140 bytes
SHA-256: 85ff4768b3a95952817cbb4ab1a4462ff813965d9088d855aadb1c01ea43ab5f

Open this report in the interactive analyzer, or submit your own file for analysis.