Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4479c66e7a2261f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-22 00:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3f73931edefa77cad8cdba3093ec4676 SHA-1: 8353b8897a81159bda129ebf4e8a2a271df02e11 SHA-256: c4479c66e7a2261f446e65f936969d870481c563fe2d36a8cebb5f1a4a2909e8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains a large number of embedded links, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/123?utm_term=b+tech+film+song PDF link annotation
    • http://kufafukedexepix.mygamesonline.org/measuring_triangle_angles_with_protractor_worksheet.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/93274242208.pdfIn PDF document text
    • http://5coupons.info/78135107443gx08n.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/69267191913.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/what_meals_are_good_for_gout.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/aricept_davis.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/67352878650.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/elettaria_cardamomum.pdfIn PDF document text
    • http://1fps.ru/lagasoledijosofewukimqaewn.pdfIn PDF document text
    • http://boforobevuziko.mywebcommunity.org/mathematics_olympiad_questions_for_class_3.pdfIn PDF document text
    • http://verification-help.business/kugibiruxadevenamonxh7fo.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/femekojimufukukun.pdfIn PDF document text
    • http://discount50it.pro/82949381418ed073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/390f16dc-49c8-4b71-8ae9-6fd6c9ef5c01/42875743560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7050b114-cb07-4346-afca-3e16aa5f001b/tazopaz.pdfIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/board_game_table_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460f0115-0d82-4475-b972-2cda6966e69f/margin_of_safety_seth_klarman_audiobook.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_4c2914a345654b2ba1b4a5a3d2f6f0bf.pdf?index=trueIn PDF document text
    • http://tibamupebunod.atwebpages.com/interpretation_of_financial_statements_download.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_79e5e37ccf954d138772eafd22b54818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21417dc5-1344-4560-85f0-d9f0936c3411/what_is_the_possible_theme_of_translating_grandfathers_house.pdfIn PDF document text
    • http://gamelaluwer.myartsonline.com/strategic_versus_tactical_asset_allocation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 4824 bytes
SHA-256: 1f29c12064e9547ba4829cbb553d350f25083bbc287ff329ac05d95128bdfe67
font_01_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 11160 bytes
SHA-256: 627108a5a5d7dcb286ad485c5eea53223e33392adaacf330c2ffcd217bd74885
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230