Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b0750bffddbce…

MALICIOUS

PDF

78.3 KB Created: 2021-03-03 22:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 41032e809b711514eaa8310ef5054263 SHA-1: 87d74f0488fe8bd12da2f40ac9455cd22936bb22 SHA-256: 538b0750bffddbcecfff1cd9ece1bc0bacfffb62f2bcb361c5b690c28dc1ea19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/aws?utm_term=how+does+a+killswitch+work PDF link annotation
    • https://cdn.sqhk.co/laripikiwafo/o4qbhiN/rabbit_arcade_fighting_game.pdfIn PDF document text
    • http://all-system7.club/introduo_ao_projeto_de_pesquisa_cientfica_franz_victor_rudiourp8x.pdfIn PDF document text
    • http://naturwows.space/bioshock_infinite_achievement_guide_and_roadmappd2i9.pdfIn PDF document text
    • http://straponartist.com/how_to_adjust_analog_thermostatmfmhy.pdfIn PDF document text
    • http://ibkreactiva2020.com/sixozogaqw3jd.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/kupikozujowija.pdfIn PDF document text
    • http://kleomaften.online/25524684216iy601.pdfIn PDF document text
    • http://baffer-shop.space/lagaxajuguxodod3izly.pdfIn PDF document text
    • http://monongzhlh.space/ap_psychology_midterm_review_packetxh9n7.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/xukokubivarijej-xolipasunawar-zodineremu-ribulezosopawe.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/bFZjgih/nbc_sports_app_roku_4k.pdfIn PDF document text
    • http://neojust.ru/all_pre_hardmode_bosses7i2xl.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/waxevuwofilono_fagoz_luresexodu_deroga.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/libusamagowuvo/28831530608.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/what_is_the_best_college_for_information_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/anemia_falciforme_valina_al_posto_di.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/microsoft_windows_active_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/44229394857.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/peavey_vypyr_vip_1_how_to_use_looper.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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5144 bytes
SHA-256: 5116c68ba02194962f8071208d3635e6605b898bb7042aa20a32f0983a72444c
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 10388 bytes
SHA-256: fbbcdf85196190fa61c194188a9f70c7dd9385bc167b8f8d0991f7a3dcb657e8

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