Malicious PDF — malware analysis report

Static analysis result for SHA-256 f191f8c640635a2f…

MALICIOUS

PDF

80.3 KB Created: 2021-02-01 05:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3d8ee3b4d62b440ca6f047d227299c06 SHA-1: e9914542e7968bccf30f4b6b2c9b33fecc5a69d0 SHA-256: f191f8c640635a2f809955fa602ee729523efdc470043b50a976a3fb342a3ca9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests it's designed to redirect users to external sites for further exploitation.

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://seumenha.ru/123?utm_term=nivel+de+lectura+primaria PDF link annotation
    • http://videohost.space/kizarazoj6qibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fef5a0a9fae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fc9b1b08c78e.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/9abe322.pdfIn PDF document text
    • http://cyberlife.store/advanced_root_checker_pro_apk_free_download6yvsx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fe33380be6ec.pdfIn PDF document text
    • http://betmoy57.com/area_of_complex_figures_worksheet_6th_grade063xf.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/igQjfif/pro_series_drag_racing_app_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/ijPogdE/wish_away_meaning_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/PEhenjb/xexevejekitewiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fukezavazuj/m1_junction_10_traffic_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/zilebonalivi.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/feponakirusesatuzixamabo.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/ralinowizobuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 4736 bytes
SHA-256: b14bc7f048db5dd454a19da89d5b3f6b4dffe7ab9fca99066541377a9a0a1818
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11288 bytes
SHA-256: a56d90150c97ff91b9102da0ac8192fbb27fb6c32f6332c9cff21f60c543aeb0
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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