Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0770e79364babe…

MALICIOUS

PDF

70.7 KB Created: 2021-03-17 09:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b32dbdd9ed18131315b6dce14cabc554 SHA-1: 7264e07334ef5f4700a1f06650cdd3a3a8059bea SHA-256: ba0770e79364babebe359b5fa693a8acbe7f47f429e334292f3bc32ba25c71ca
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 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=compound+shapes+area+and+perimeter+worksheet+ks2 PDF link annotation
    • http://airet.space/how_to_start_a_craftsman_weed_eater_with_a_drillkxzfk.pdfIn PDF document text
    • http://netekigupi.22web.org/libawerix.pdfIn PDF document text
    • http://xosijitede.22web.org/sisoduzopomumegitamano.pdfIn PDF document text
    • http://priz24.site/how_to_change_code_on_genie_intellicode_keypadeiw3p.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/how_to_write_loops_in_pseudocode.pdfIn PDF document text
    • http://nicepics.xyz/wovobosejiderubenwzv5v.pdfIn PDF document text
    • http://qwonder.space/cloud_computing_definition_in_computer_scienceb3exy.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/find_missing_angle_of_triangle_worksheet.pdfIn PDF document text
    • http://student-yurist.ru/the_hunger_games_movie_download_in_tamil8ydpf.pdfIn PDF document text
    • http://kizadunejin.22web.org/begobilizigivudigala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_f096d53ed16b4175b5b5274106edf670.pdf?index=trueIn PDF document text
    • http://kobuxotaregudes.rf.gd/dark_mode_android_instagram.pdfIn PDF document text
    • http://gowejolu.rf.gd/gta_sa_cheats_android_free.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_30b6b12d756d43d08d3c3e762b52df87.pdf?index=trueIn PDF document text
    • http://wisituvoj.epizy.com/is_python_a_good_coding_language_to_learn.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_8e7f0b3b4d034d929e5448965c3248ee.pdf?index=trueIn PDF document text
    • http://nixutemexeteted.rf.gd/55904387412.pdfIn PDF document text
    • http://bevomozovedem.rf.gd/cmos_digital_integrated_circuits_analysis_and_design_4th_edition.pdfIn PDF document text
    • http://giwofigu.epizy.com/povusujofinumiwowofusawon.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/honeywell_energysmart_electric_radiator_whole_room_heater_hz-789.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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 5360 bytes
SHA-256: fa5b5aed1e3ed1772be7b148e51184f73b21e56f1bd40efd45e8627a7099baf8
font_01_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 10460 bytes
SHA-256: bd45d767c91962aa101c7b0ba46267405eeda69cb9dd9111e55649ec930d6512