Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e4ff6130d295b2…

MALICIOUS

PDF

70.2 KB Created: 2021-03-23 14:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6aac1737c6f7548485ee4811ae6648ce SHA-1: 16042b72ee8fdf6a8196e7d33a280ddf8a01a685 SHA-256: 95e4ff6130d295b24d5c37c5ed792c1f8fc83a7c7b8fcfc7f77a0ae7d950a1ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=queue+implementation+in+java+example PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/gsicr40/33452960563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d866f04e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_604200f1b8a84.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/igByZig/80956621961.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/linux_command_line_cheat_sheet_text_file.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/machine_learning_reader.pdfIn PDF document text
    • http://podonebatimekel.22web.org/angular_file_upload_formdata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5febf71075b09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/how_to_write_a_case_report_neurology.pdfIn PDF document text
    • http://kozifina.epizy.com/71173403541.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_d91712f6f4f14e5e9fe33ed8eb3365ef.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_8743e0312e5a4905b513f934265f5dc6.pdf?index=trueIn PDF document text
    • https://0c8c362d-a371-4808-bd54-be8feebb0ce1.filesusr.com/ugd/0182ef_b032fca15e9f4c3aa14ea1d4ee12c203.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/python_for_machine_learning_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/mercruiser_4.3_mpi_engine_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/quiq_battery_charger_lights.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_5d58afa35a5c4839b259fb323ea5abd2.pdf?index=trueIn PDF document text
    • http://duginufolos.rf.gd/another_day_in_paradise_piano_sheet_music.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/41326726989.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/dabosux.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 4956 bytes
SHA-256: 7c2d8611a82eef38c7e84975a4ffa9d0a9fadb213358ac0d7a05f5518617d0a7
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10032 bytes
SHA-256: 3673e30da8441100cca1d77354f059a6b31fc271ef4245ecbb76a695ff81e45a

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