Malicious PDF — malware analysis report

Static analysis result for SHA-256 6157b360ea3fc9c6…

MALICIOUS

PDF

77.4 KB Created: 2021-06-12 17:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 74704ad2e5cb6541dc78600f95ccf9a8 SHA-1: 09a0b1da09255d806797429eb3bd708ce4fead9c SHA-256: 6157b360ea3fc9c6dfdaf7f8b07cca27a819fc35d68704090455269ab4595262
104 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'queure.ru', which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'math riddle questions and answers' to entice users to click the malicious link.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/pbw?utm_term=math+riddle+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5ffa4da99a4a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5ff55a8b386fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_6052e9d2d3850.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://uploads.strikinglycdn.com/files/88924329-e7ea-43c8-8086-254231b0cc4f/84514160533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddeb9fd9-2ff0-49c6-9b49-9926801904ce/antihypertensive_drugs_mcqs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcf223b-b017-40b3-a4cd-e3d826b1b092/natural_way_to_draw_out_infection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e190d12-cfbb-4614-9531-cf173c2a8596/ford_tractor_parts_for_sale_on_ebay.pdfIn PDF document text
    • http://wasazejis.pbworks.com/f/11298925680.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/w/file/fetch/144658440/bootstrap_profile_card_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd4d505-abb0-48a2-b68f-52b9a3fca230/41591736214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3f05b7-c38f-4919-b12e-1ad36a0ab4d6/mathematics_books_for_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dfe0f9-95b2-4778-8cdb-e66435a2711d/propresenter_mac_big_sur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6b769e-5dd4-42b0-b635-bb88caca0347/letra_de_hossana_marcos_barrientos_con_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fdc302-1e0f-4c2f-9cbc-7c417ab98cfd/kupufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ef2994-6d99-45f6-bfec-4928f9daf61b/equivalentes_de_3_4_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64600ba-8fd7-46c2-96ba-648c3b578a77/african_countries_average_salary.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144475701/how_to_fill_out_a_certificate_of_origin_form.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5016 bytes
SHA-256: c02baf7d82921ee8f01c419f5d6a17843690526324bb6430bebec6219f68948e
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 11468 bytes
SHA-256: 0d90199cb002ed52f2788684e497e3692b3beb79aac66e76544703d7765704bd
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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