Malicious PDF — malware analysis report

Static analysis result for SHA-256 68738d2911a8fa41…

MALICIOUS

PDF

73.5 KB Created: 2021-03-26 09:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4ad9520a7d9eb15f0327beba834293f5 SHA-1: 59edee18d661dd5606a8ca70734a57a877026e34 SHA-256: 68738d2911a8fa41e9f8f67285a98914b7d6122dbee69b8fba3845b7d33a9717
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct textual lure is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=grace+school+of+dance PDF link annotation
    • http://lynciguest.com/are_my_ceiling_joists_strong_enoughdg4nr.pdfIn PDF document text
    • http://idem-peshkom.ru/punctuated_equilibrium_model_examplesizlhj.pdfIn PDF document text
    • http://bio-ita.fun/48070346003u3i0k.pdfIn PDF document text
    • http://whitetwo.space/261457211401kgsj.pdfIn PDF document text
    • http://opencabinets.xyz/proc_univariate_histogram_y_axis_rangeexub3.pdfIn PDF document text
    • http://winsbig.space/gitujifutulubupolikamagap3gqng.pdfIn PDF document text
    • http://trysol.xyz/lovavupujidemaxoopf1o.pdfIn PDF document text
    • http://hotita.space/ignou_assignment_front_page_freelmrkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5ff970c4e5d21.pdfIn PDF document text
    • http://choosenews.space/65859153042vb42w.pdfIn PDF document text
    • http://goldstein.berlin/maron_y_pruttond7z5t.pdfIn PDF document text
    • http://sparzha.club/46950315761j4jjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fd95b10b0acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ead961-a0ca-43a9-92a6-10e68175db39/zenesulejavegoferasoxodil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d44c1e8-3ee5-4a6f-a19e-87cff56e8d8b/wood_log_table_top.pdfIn PDF document text
    • http://jusumexavajuzin.epizy.com/symmetry_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f287865a-131c-4ed7-b28a-ae0af0ea8c3a/xesuxijokefurububelixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a7c790-bd72-4db0-b95d-ae3834e13f0e/converter_wav_para_midi_online_gratis.pdfIn PDF document text
    • http://romutipi.rf.gd/amstar_2_checklist.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 5140 bytes
SHA-256: 7e859874b7669fd83e7d960d871275fc4b6fb48d5c42c3e30912bd9dfa9949eb
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10616 bytes
SHA-256: 54339a98e0e6aba42f280f994dcc783cfc00668c2bed45c868ffd49d6c6e776d

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