Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9378e8c3f96251…

MALICIOUS

PDF

73.4 KB Created: 2021-03-24 20:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b6a66aa394ae192c8bb85f5419f3a910 SHA-1: c3a17cfaaf4ddeb1a9a086237021a2b263741b6f SHA-256: 9a9378e8c3f96251e3845d86500aefb0b3717a15b762714b1a9028bf864ed3df
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The embedded URL 'https://baarspo.ru/award?keyword=pdf+acrobat+pro+dc+free+download' suggests a phishing attempt to trick users into downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9136

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://baarspo.ru/award?keyword=pdf+acrobat+pro+dc+free+download PDF link annotation
    • http://morpeoplelife.ru/rudram_namakam_telugufrk76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_602055ace97d7.pdfIn PDF document text
    • http://velixone.66ghz.com/autonomous_things.pdfIn PDF document text
    • http://pemirok.22web.org/61161383577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_60040c0797784.pdfIn PDF document text
    • http://affilateapp.online/92811280543nlef7.pdfIn PDF document text
    • http://wellwork.site/sitetekuwisulazokasipedz8oxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe5a1541c311.pdfIn PDF document text
    • http://bilkaita.space/wisujirixitatafitegqy801.pdfIn PDF document text
    • http://autolombardpro.ru/82674042941u8wb3.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/kemamezinupitau9k2l.pdfIn PDF document text
    • http://podjem2.club/cuanto_gana_un_juez_en_argentina_2020u8gpn.pdfIn PDF document text
    • http://13millions.store/how_to_reset_password_on_alcatel_one_touch_phonevszv6.pdfIn PDF document text
    • http://train-home.ru/wirusajapopovoxatujelexarcnuo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_3a6d812ab4be4dfdadb67b4c2906fa95.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_a3ab82df00084f90bc913e4dd4280a44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2b4435-4773-49ff-9f90-d7042b94eee2/app_para_aprender_ingles_nios_3_aos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881e3493-eb2d-4305-800b-2614f4c64aeb/how_to_master_the_art_of_selling_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b027394-b8f8-4281-a368-a60dd65597fc/am_j_respir_cell_mol_biol_impact_factor_2018.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/escape_room_game_answers_level_137.pdfIn PDF document text
    • http://moferamobonar.epizy.com/community_acquired_pneumonia_treatment_guidelines_cdc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66348ada-9a97-4e7b-96fb-cd70b958a993/does_the_navy_have_a_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fd63d6-db0a-4ac7-8a38-6610ba3fc0fe/93699124511.pdfIn 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 5204 bytes
SHA-256: 292dc47cc185688dfb4a67ac68edde33c31a5c04c3f84374bce10784f113a084
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 22280 bytes
SHA-256: 4fa133fbedcafd4509b0419a1a4766d08212f840b740af50deb4a202b389a7b7

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