Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7c18f89dd3fde5…

MALICIOUS

PDF

72.8 KB Created: 2021-06-14 00:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 811f1b6fe8eda9dfd9b6204199982f9d SHA-1: 66b2f2571ef3e3304bc6e2c19c85fec06156309e SHA-256: 6f7c18f89dd3fde5f8c407058a4f486b9655ac1167f36ae16d3ad84122c13ad6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself is weaponized to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=pulse+amplitude+modulation+pdf PDF link annotation
    • https://bipasomuted.weebly.com/uploads/1/3/6/0/136010989/1e1dd.pdfIn PDF document text
    • https://fosakozetabu.weebly.com/uploads/1/3/1/4/131483491/fumavime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_60b817f9ccb42.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/4913330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_603a9e43cf6ed.pdfIn PDF document text
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/038c3f4e6.pdfIn PDF document text
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/rigowozuv_dalovamil_dowijojejovur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_604bab1e1363a.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/bilaxane.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/d7209e2a904c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144630351/how_to_find_kanais_cube.pdfIn PDF document text
    • http://xolajaz.pbworks.com/w/file/fetch/144767541/mobile_legends_skin_hack_2021_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a43197-9f10-47e0-98dd-3e4b70f1b56e/nutritional_information_taco_bell_refried_beans.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/w/file/fetch/144688740/61323769901.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144930141/wovejokimigijojefuzoviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1342ad73-b9ed-4562-b094-ede87730b555/on_my_honor.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144562089/why_does_my_dyson_dc16_keeps_cutting_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c6cc9b-9409-4cb3-8002-6472ecf54d70/how_to_set_citizen_eco_drive_gn-4w-s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53de2609-1445-4d82-a016-64f4bf43fbf7/charge_du_condensateur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dfd120-0c8b-41b2-9ec5-988a51c3877f/how_to_play_croquet_for_beginners.pdfIn PDF document text
    • http://xereledo.pbworks.com/f/60421519674.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/why_does_the_standby_light_on_my_hitachi_tv_flash.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426531/17130423715.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5092 bytes
SHA-256: 9178dc03e72f830d83e92797f113f7e97e9cfa49b9f2a0d60cadf7da0727ee86
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10964 bytes
SHA-256: 485d1d7c6d83ba68438ee0522d947b851c04e51367337d0e4f07c62782814a56