Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4f46a3df6023f…

MALICIOUS

PDF

77.3 KB Created: 2021-06-07 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bbce9d2fbe47e331183a8c27615258a5 SHA-1: d6ff2bcbe95a9631511c48758ba3d36ae092a93c SHA-256: 6cb4f46a3df6023ffea09ba6a9bc8fa44c1a67f5a4e028ddc0f26af776d3043d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=disclosure+as+per+icds+in+audit+report PDF link annotation
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/nifarefikisuv_bimudimunoku_gilebivuwot_xitakudaped.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416495/normal_60b1a2993ab4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_606803107ed84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_603174323de43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_5fe9925ea0ba5.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/zaribadazelu.pdfIn PDF document text
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/tarulaleb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_6008faff8ce44.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/7244d6b3-8a48-4def-ab42-364e1c2d9b57/49386908341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9755299b-19db-41bc-8d15-e3c86593b36c/flow_chart_creator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5593ee18-8300-4010-956d-d016b489a800/how_to_draw_anime_bodies_female_with_clothes.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/14345981018.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/clasificacion_de_retinopatia_diabetica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17a5514-d2f3-4042-893f-05ff4d316594/doubt_john_patrick_shanley_full_text.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144437418/javonikemufosotovugikem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3596dfb4-4244-44c4-9e85-392471b567d6/shark_navigator_vacuum_filters_nv71.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd60aced-7e78-4908-8c1e-c3b603821275/jumpsuit_lyrics_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c89dab-a078-4ef4-8360-38badac2c53b/why_is_my_dometic_refrigerator_not_cold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e803528-8dbc-4893-b298-45dd30074597/id_rather_be_happy_than_dignified_meaning.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5064 bytes
SHA-256: 98bd7bdf079970db36afa0755745c1a75d4b440e68e127495a33341f0069757e
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 11428 bytes
SHA-256: 377f0bffdb8c81a7c4d7bdf3b2f7f297f35012b02050ba082b398d887be74696