Malicious PDF — malware analysis report

Static analysis result for SHA-256 788ace0581205685…

MALICIOUS

PDF

84.9 KB Created: 2021-04-05 23:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f731796732bce826f8163f3b6a652c87 SHA-1: 5e60dd66eb5fd5ad38220609a98ea34ca2f2f84c SHA-256: 788ace058120568508347d16f2612f0610567d1fe3a0f19edf439ce3e68ca939
126 Risk Score

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 0.9991

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://mezovuduw.ru/strik?utm_term=julius+caesar+act+2+scene+1+and+2+summary PDF link annotation
    • http://dikegebe.mygamesonline.org/4489068042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_6053647025907.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/zatog.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/physical_science_grade_12_study_guide_free_download.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/dumuxipikomudafojojub.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/8-1_skills_practice_geometric_mean_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_60581ddfacd47.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/deep_learning_for_computer_vision_with_python_adrian_rosebrock.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/rovosomaduzizunid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_602205947e0ae.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://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_c6e9784bc5014ad689d21c3c0c2bc646.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0875867-edd0-423d-b7af-ead5029cdc1a/overlord_light_novel_volume_14_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2f761b-5037-46a4-931d-776b2f8f3e23/gokivozigeveviravefuj.pdfIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_a026212f004f434e91713b42935160ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b23690-a541-480d-b79e-4d04a2c6983b/what_are_the_48_laws_of_power_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ed8088-c8ab-4e7d-9d57-f3f25f3940f1/xeleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b46fdc-ea04-4ad6-b8ce-36310b654b07/purposes_of_law_in_a_country.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40e8c8b-c2b1-4531-9b9e-95ee04776747/mukug.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/taenia_saginata_life_cycle.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_ed23940502204479adcecc167177c211.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_70d9bfb0441d4f90ad852a7b3983c1c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f636ca-74c0-4add-b612-9177a3dc8af3/xazopesolexokirore.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_60ec29f7f6564edf9d15d932bdefb4a7.pdf?index=trueIn 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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 5132 bytes
SHA-256: e803e4dc091621127554f13b1c9dac214a8c21538d7a9e552fa656d2a75df846
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 10400 bytes
SHA-256: 483a308fce3137467fbf1bdaeda698d8425cb4ac22a3a31232a0222c515cf77b
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34