Malicious PDF — malware analysis report

Static analysis result for SHA-256 4745895b153e90bf…

MALICIOUS

PDF

82.1 KB Created: 2021-03-11 09:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d643fba57d3e345ed7b52ca170df5a1d SHA-1: 917ee27357b3f84b1ff3e4065fb4d15dcdd44456 SHA-256: 4745895b153e90bfa0eb8f067208af824de868898e44a7d57f6b80698c93c11c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with two pointing to disposable domains that are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'hardness test for sheet metal'.

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://midufefew.ru/123?utm_term=hardness+test+for+sheet+metal PDF link annotation
    • http://zitirisiz.mywebcommunity.org/gasalixuxajajesunojukufoz.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/takefabavuramufo.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/bihar_board_10th_admit_card_2020_download.pdfIn PDF document text
    • http://vesimawamom.66ghz.com/64343000691.pdfIn PDF document text
    • http://dapodulasopo.iblogger.org/misunodavetezuj.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/becf4e3c-e5e8-47a7-8ce2-4885fdb7c1c3/how_to_make_a_pistol_shooting_stand.pdfIn PDF document text
    • http://bepukugi.rf.gd/serial_killer_hollywood_movies.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_d9d3f075c66345c8a9248e91a38c50d9.pdf?index=trueIn PDF document text
    • http://gamadajizi.rf.gd/basit_bileik_faiz_formlleri.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/muvizulosobewepokovatixif.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/92975292197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528dce01-9722-4cc8-9e8b-c90a27681449/what_are_static_dynamic_flat_and_round_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47e414a-12fc-478b-8df6-54c9b011d6bc/english_grammar_fourth_edition_audio.pdfIn PDF document text
    • http://bexukopelut.epizy.com/who_is_the_killer_in_the_killing_season_4.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_f34b313473c240fa914d3ce4ac073533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0349e26a-0ad2-4c3f-8d6c-ecf9a633ec46/haiku_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0ef2fd-c2d4-4098-9a57-892ae361cfc5/how_to_use_viper_car_starter.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/ganesh_ji_aarti_marathi_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38860267-125f-4c8d-96f6-7f66fef5c3f0/black_and_decker_spotlight.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_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5108 bytes
SHA-256: 9869ce3c15ac21782c55de2a298322f043cccf99a6fddcb271d6def71d63c0dc
font_01_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 10464 bytes
SHA-256: a802de53fc948ab83fa9360871c56fbc780f100d83e3b81bb6b8dd2e2d58a4fb

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