Malicious PDF — malware analysis report

Static analysis result for SHA-256 40506950ce4d9c4d…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 19:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f2601d96d335cad21a6cf90837520d72 SHA-1: 3dd12d5a661dc92da3a10081922026d695cdfcee SHA-256: 40506950ce4d9c4d0adeaaf3e2da7ace6236988a94b9e7487aa1449e9b5ed34f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to generate traffic or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://vilenefex.ru/award?keyword=marvel+characters+list+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418764/normal_601a0c310a47d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd2e41b9b251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fe915b92b8b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_604637be98e79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_60068c9a945f6.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/88db79da-8c1e-4d3e-acab-74994e241ef4/sql_cookbook_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c447bb15-6ecc-47bc-b5b9-1078880d3f97/34397030972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4d4002-d7c6-47e2-9c49-600900ddb5f6/bidemewawaparoguk.pdfIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_720a9a97079d4f2d916c4395eebaf633.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad717b4-f328-4425-acb2-0b645df91507/dramatized_niv_audio_bible_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/rowdy_baby_song_telugu_maari_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1939742-8cf4-4e77-a8b8-5f1faf037c4d/review_serum_chng_lo_ha_timeless_coenzyme_q10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034e0c70-0fd1-4d33-8e2c-ab2def0742f3/essex_county_council_bus_timetables.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/37075878682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655f6f53-da94-428e-a0f9-d2c8e9125c1b/wenaveb.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_b8d733ed6b1d47638a6b9c18874be951.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3322b847-c61e-4744-ac34-e75fe2458d2f/how_to_make_tea_essay.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_64c428f682224a208eea086611a50bab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/what_are_the_elements_of_music_present_in_the_national_anthem_of_the_philippines.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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5308 bytes
SHA-256: f632ffb3e3b722f596af7c04510afd4d95db90745640cd6f7d84d31a48a7dba4
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 11320 bytes
SHA-256: 85fba2eddda4a55eb6104a4da303f632b7a270e1b2d8db47575f85fa19cb14ec

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