Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb6a30f681ae96c…

MALICIOUS

PDF

164.6 KB Created: 2021-06-07 11:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 13597fe52042a964e9089f459f2ed264 SHA-1: 1b5da41479f302fc0811b5c8505d5c811e21f982 SHA-256: 8cb6a30f681ae96c9b46fe84c1e0e23b43def2a7fecb6c8d81db44ae9d48c068
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/pbw?utm_term=manual+de+instrucci%25C3%25B3n+de+orden+cerrado+de+infanter%25C3%25ADa+sedena+2018 PDF link annotation
    • https://dutigopomifit.weebly.com/uploads/1/3/4/6/134611267/xesuwipofik-xelikonevan.pdfIn PDF document text
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/4076271.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/1935872fe7dc184.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/00c2543860.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/7685746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safopiluzaw.pbworks.com/w/file/fetch/144757620/12776947939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cf24fa-0974-425a-b153-d3de34d2183f/english_grammar_exercises_for_class_8_icse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38e3d48-c557-4571-9814-d30ab6f76745/analisis_y_diseo_orientado_a_objetos_de_sistemas_usando_uml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3d7246-909a-476e-a74f-f90d9e6616f5/essay_topics_for_english_assessment_test.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/alldata_repair_2018_full_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a0f4fe-f340-4fa1-b893-3820972f76bb/can_you_have_multiple_wives_in_sims_4.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/substantiate_used_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bd776b-3c33-4130-90a9-4768fb604cf1/23823848433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6708c71f-95e3-4d38-be7b-fc55889dea08/cubeta_con_ruedas_en_quirofano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ff6771-bc71-405b-9168-86e897f07834/audio_technica_at-lp60x_bt_turntable_review.pdfIn PDF document text
    • http://zezupagijene.pbworks.com/f/12th_biology_book_download_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e74a04-c599-4b76-b57c-1b2d34ad84df/libivorobiveteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fe1ff9-d998-4670-8146-87ff3cf6c3ef/ganibejorafovidep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b365ff-29ee-496e-86f9-0b52c93b9df9/will_aot_manga_end.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B39 5728 bytes
SHA-256: 14c3a5ad2586a3a3634d5455a1c4005f2ed303b7f1a7af39260bfabf10a04cb2
font_01_sfnt_off00023e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E8F 14208 bytes
SHA-256: 5e198800eace2cf34d710a0447f322a60b3d87d11abf2ce12fd08bbe669d2c31
font_02_sfnt_off00026bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26BAB 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501