Malicious PDF — malware analysis report

Static analysis result for SHA-256 1517e12ce2414cf7…

MALICIOUS

PDF

74.7 KB Created: 2021-05-29 22:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 685efc6c97abf10782ba6cf89611b150 SHA-1: c3c0e50e2dc7ee142aa2474d582e4f70ef4fd0a5 SHA-256: 1517e12ce2414cf7d6eab5182bdefebfd556c6a92e7bfcf5a6ecd6b5c2cf5811
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=business+case+options+analysis+template PDF link annotation
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/binor.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/tibarota.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/7747988.pdfIn PDF document text
    • https://zuladaziduvixu.weebly.com/uploads/1/3/0/7/130740320/5781762.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/valipojaketuva.pdfIn PDF document text
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/5941083.pdfIn PDF document text
    • https://kivasemav.weebly.com/uploads/1/3/2/6/132680863/5ebd3ea927ba84c.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/wimoruwefomo.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/xijubivo-giferevax-labun-lumigigu.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/65dc8a3d-d49d-44c0-9bef-955929781a1c/19309949409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389a3bf7-d500-4961-b9d4-ac6e8f5dee5d/14491236260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddded1cd-327d-4b84-be4d-2c04170c0170/kowisefosimaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229dba67-a99b-4be0-b406-8d498aa563b7/interview_questions_and_answers_for_project_management_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455516ce-03dd-4457-9890-54a50668a882/explode_the_code_1_teacher_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d539cc07-bb00-4ca6-8984-89c62c0f8e6c/ms_office_2010_activator_toolkit_v2_2.3_ez_activator_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8c2af9-446a-42b8-a413-adce989692df/kizoa_movie_maker_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1148b099-dc36-4145-8087-5f0cdc34639c/does_directv_4k_cost_more.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69df004b-fc0f-43ee-8275-c9983df1e7df/dunkin_donuts_breakfast_menu_with_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ebde09-716f-41ab-9a19-5b96c535d81f/lujijiximavirefi.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5132 bytes
SHA-256: 78900b6945c1acd8cc5aea9bd4239c1e50252b26fb088cc3726a76613035d92f
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 10412 bytes
SHA-256: be459eaf235824787d1f3f16c461ae3409a58d02188af4b86906731b5d37053b