Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb18ca6ab59d3c…

MALICIOUS

PDF

77.1 KB Created: 2021-06-12 11:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 25fcf2901daed0ec41282357e0bf0120 SHA-1: 9fe8a30a8198be28f8a56552ef27f34cbb84c603 SHA-256: 3fbb18ca6ab59d3c7c87e0041875fb2d7031adb4cea4907f1bb46f582532fb85
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/pbw?utm_term=download+azar+hack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5fdd841b433da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_6031d8524fb62.pdfIn PDF document text
    • https://nitorotejixet.weebly.com/uploads/1/3/6/0/136082153/zilefevatibi-guzopadalewufo-deputusenapaw-kupuv.pdfIn PDF document text
    • https://ziwobusomuka.weebly.com/uploads/1/3/1/6/131607005/ccbff2cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5ffe4e2d66e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_604d25f724502.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388412/normal_60b3fa5e95397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5fdd2ffdbca2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff15c468d94d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5fc732db9f658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5ff4319e4b0bb.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/sugiwazawuzeva.pdfIn PDF document text
    • https://bufopajej.weebly.com/uploads/1/3/5/9/135956722/dozipajoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_60496ae87987b.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/8b70ccaf-d755-49d0-adc6-8a55d6332463/how_to_answer_angle_bisector_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029330c8-0534-4ec9-a5d2-0481f0a5be1b/bodiwux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ceb7d2-5f19-452b-aecb-e222ae1328e9/software_testing_interview_questions_and_answers_mcq.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/f/cute_baby_animals_cartoon_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cabcdfb-3664-4196-a713-4a73e4e7f11f/axe_fx_2_patches_for_sale.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144441093/state_of_california_death_certificate_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ece8463-407f-413c-b18c-aaa817bf977e/how_to_list_the_folders_in_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4360b4-ba06-4f64-997d-49ef11b5340a/is_lg_cosmos_3_a_4g_phone.pdfIn PDF document text
    • http://bitejite.pbworks.com/f/robudagedipiluzivalave.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5052 bytes
SHA-256: 1e99ffff06c598fc08d68784be3a1c84ad7f10105c524c9eb1bb45b4ded356eb
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10948 bytes
SHA-256: 637f63fa89b99a1a64266b8b9ea14d59ccfba55caff36f02807f3dcc9d7e026f