Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a051844c11fa0d…

MALICIOUS

PDF

77.5 KB Created: 2021-06-02 00:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5040b25abdad5d17f5731687a11b614c SHA-1: 5e198a3f9ace2c9ea9390f01313eaeebaa30ce96 SHA-256: 54a051844c11fa0d45cfa1b7932cb9f8d8427a3ed924754ed91835f5639c797e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/pbw?utm_term=what+types+of+intermolecular+forces+are+expected+between+so2cl2+molecules PDF link annotation
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/6cce38d.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/zetitomezor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_6063603d174aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fe6f32dd7cb0.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/6c98e.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/8275757.pdfIn PDF document text
    • https://bufopajej.weebly.com/uploads/1/3/5/9/135956722/39ced639.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/8f0418b2-0ba9-4d4c-be83-905880672776/lewis_heitkemper_9th_edition_medical-surgical_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7493c832-b86b-4d67-97b7-78a6aa65d27d/clash_hero_server_2_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580071db-4684-4571-8ebb-c97e8d73e17b/how_to_calculate_3_firm_concentration_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e7a74f-c1c0-4f3c-ac85-532c983a90ca/perimeter_of_polygons_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bc2144-2a77-4882-a117-2281aef91d10/sugar_detox_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4f9145-b01d-4b02-9632-2c1be2415977/what_punctuation_do_you_use_when_quoting_someone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21ad8b0-8d0f-4a2f-895e-98ba0deadd15/glencoe_science_biology_chapter_11_assessment_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72982b3-60fb-4990-9103-f638ef6bc438/tupifitizasej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b23681-e1e4-4ccc-8378-911117a0bc82/jatuzelodowiwotigenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ebb2d1-4367-4cee-8547-938ccb4f5549/bonaire_evaporative_cooler_not_dumping_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a39ff4c-9903-4331-8ee5-afe11b52b798/45848996234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615e7b6c-9e2b-43d9-bc14-89ff23064b99/you_are_the_reason_gospel_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ed89fc-2176-4586-a41d-786e90b4088e/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5687ef-ac7c-4d0f-a4c7-d4997ec52129/collective_nouns_exercises_for_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704e2446-63c9-46a5-91ba-39403e947c37/what_does_ke_mean_in_chinese.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5940 bytes
SHA-256: 9885c491cb04b5289bda248f49b41292dd6ef5dfa29c56bd9a041bf181f574f9
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 12292 bytes
SHA-256: ca0190b8f4731883faec81b3a1dd06011b89b6667cc2ce97dc2d19e56279f4b4