Malicious PDF — malware analysis report

Static analysis result for SHA-256 27467e2490136da3…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 20:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 44ce402c208bf7c19d96ab74f65501bd SHA-1: 4ef23b09e548c5eaca7f09475cccdb2008a53df1 SHA-256: 27467e2490136da3b51cd7506d37ed0d7c6b1ef978c5d3b55f2ce32ff60044b0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially obfuscated, suggests a lure related to visa applications. The presence of numerous external URLs, particularly the one pointing to vilenefex.ru, indicates the document is designed to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

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 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://vilenefex.ru/123?utm_term=taiwan+visa+application+form+for+china+passport PDF link annotation
    • https://cdn.sqhk.co/govonesed/iejjaif/lazokanudemofamidetegu.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/advertising_vocabulary_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fda5281468ce.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/oracle_database_pl_sql_language_reference_11g_release_2.pdfIn PDF document text
    • http://jawuzoruba.iblogger.org/anorexia_recovery_skills_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6036c107be312.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gLQeQP2/house_painting_cost_estimator_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/ghFiipF/manopigezogu.pdfIn PDF document text
    • http://wuteziben.iblogger.org/lolaketotidedomefuveni.pdfIn PDF document text
    • http://vipiwizazuvuj.22web.org/46051561777.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/bsc_mlt_syllabus.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/enterobacter_species.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://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_61f255515cf2486ebf574cc517962f34.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_83e2546f825041b299e26ad340157542.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_d9266c18b7944cc9878b4967c5c248f8.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_49bd45406c57470690b3d4bcf06b5bce.pdf?index=trueIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/wijuwotuxomovolarimewenel.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_8acfa27dc6544946b498015ff5f98ed4.pdf?index=trueIn 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5028 bytes
SHA-256: b3a88d9e5cf098b713f2f557ce709d38509feb0e80762d3bfeeea7f5c79e8efa
font_01_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 10716 bytes
SHA-256: 9e8749d0a191ecdca696d48f196cecac4f87732c9b81c81b118b0c19570fb684
font_02_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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