Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93177309a79989f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-17 21:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c5c6041aa50b8db87ed5b1a5513c65a SHA-1: b9291500c74a2ff28877c8a25fdc3b9d141f8de0 SHA-256: c93177309a79989f9ec55341e3701d0dac2c58dba35e405d9aa9dd79792c0cf3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to malicious content, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/strik?utm_term=da+form+for+bar+to+reenlistment PDF link annotation
    • http://fuvufurewuf.iblogger.org/crash_course_world_history_15_worksheet_answers.pdfIn PDF document text
    • http://vijutiludomin.iblogger.org/geotechnical_engineering_laboratory_experiments.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://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_3b23e066f44044e0904e0f1354305a96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/adaptation_in_animals_worksheet_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/wibiji.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/52714367747.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/batixufelev.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_d58b941b006a42d58da534bb915d4122.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/paulo_freire_pedagogia_del_oprimido_resumen_por_capitulos.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_b2522f16515643508c17b13493c47d9a.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_65dc255a9220466cb1761c0a6a8e8fb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/crm_app_for_android_mobile.pdfIn PDF document text
    • http://gaderaxanaru.epizy.com/what_year_was_elton_johns_first_hit_song.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_ca63dd8d20374ba59589bcfe4daef6c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/in_the_heart_of_the_sea_chapter_2_summary.pdfIn PDF document text
    • http://tebetuv.rf.gd/xatipalivudebuvijulapevup.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_d3224ff488da446892baa96ed5485cbb.pdf?index=trueIn PDF document text
    • http://mavavopem.rf.gd/49630239938.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_d9ffbdeab64f4ab8a6984a3fbfd64b2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/wevugipilexawubuxiza.pdfIn PDF document text
    • http://venumifulo.epizy.com/bawonuzuranapomifoto.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_6eca5fe3b7864fc7b207bf83e4123526.pdf?index=trueIn PDF document text
    • http://zagebixomibolo.rf.gd/ericsson_mobility_report_november_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/los_secretos_de_la_mente_millonaria_declaraciones.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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 4840 bytes
SHA-256: 2279269817153f51ff51e5775e1cd6d71196fe07068f0ab78633dfe7b04bc9e2
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10632 bytes
SHA-256: 8abdadfad682432e793d1ad514acce78d729705bb047b56b85c8473caf0b3a78
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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