Malicious PDF — malware analysis report

Static analysis result for SHA-256 a419d214e721ab95…

MALICIOUS

PDF

80.0 KB Created: 2021-06-02 18:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 416450212d79f77994afeb56bbc1e571 SHA-1: ab57cb199dd5d81b5abef7830b69fd3bfba0a61f SHA-256: a419d214e721ab954aa6f8cdde9867dbe17778842b33808de101eebd050ffa71
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 as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. One of the extracted URLs, https://seumenha.ru/123?utm_term=after+effects+text+plugins+free, is directly associated with this malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=after+effects+text+plugins+free
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/957f5bfe8a68.pdf
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/d6d12e7f99.pdf
    • https://sasasazar.weebly.com/uploads/1/3/1/3/131383954/zezazedetetor.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/petuvefomowozimanuwe.pdf
    • https://xolasugoduto.weebly.com/uploads/1/3/4/5/134592704/kopofazazado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fd75f6dc-fa18-442d-b910-b0db33ad6570/how_do_i_reset_my_omron_blood_pressure_machine.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144483606/query_store_for_sql_server_2019.pdf
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505512/gomimubopozagoza.pdf
    • http://fixiguru.pbworks.com/w/file/fetch/144456606/91717785595.pdf
    • http://dipoziw.pbworks.com/f/yeni_balayanlar_iin_kolay_karakalem_almalar.pdf
    • http://kiletejude.pbworks.com/f/47547658134.pdf
    • https://uploads.strikinglycdn.com/files/b731eb99-b409-4759-a86d-097403f6ebfd/12497058360.pdf
    • http://liwuvedesisu.pbworks.com/f/bealls_list_of_predatory_journals.pdf
    • http://mapijakemifo.pbworks.com/w/file/fetch/144458052/27832359436.pdf
    • https://uploads.strikinglycdn.com/files/037c13d3-ae80-4220-88c5-f8dc117a43be/dexutibopizijulutefebul.pdf
    • https://uploads.strikinglycdn.com/files/d2bf8b84-8b6a-4e12-80ba-ffa5bd73dd50/53621604277.pdf
    • https://uploads.strikinglycdn.com/files/9c775bea-3e43-4ad2-bd0d-af3b69e3a623/21124363520.pdf
    • https://uploads.strikinglycdn.com/files/6e74394c-019b-4f7c-843d-76cc804b47eb/garmin_etrex_30_specs.pdf
    • http://zabodovojif.pbworks.com/w/file/fetch/144426807/roblox_studio_download_ipad.pdf
    • https://uploads.strikinglycdn.com/files/17a01c91-a877-4952-ad82-0605817ff5f7/tajifabulaxeruji.pdf
    • http://joxupakager.pbworks.com/f/how_to_study_for_ct_permit_test.pdf
    • http://bevojoluvu.pbworks.com/f/84542764107.pdf
    • https://uploads.strikinglycdn.com/files/56745911-7dd4-49ee-aba4-313efcc2b360/ziwexo.pdf
    • http://biwonuv.pbworks.com/w/file/fetch/144460242/the_conjuring_2_full_movie_download_in_hindi_dubbed.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144431958/pro_football_game_tonight_on_tv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda5.bin
683a09c1ad2ba4f383f981e3b33229a386123585030d11f1ed8a6ba4e19950e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 4804 bytes
font_01_sfnt_off0000fe18.bin
b7d545af0173711fd359cb4a150f58b78d3b49569ca813ae9ce779547484a8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 11252 bytes
font_02_sfnt_off00012444.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 4324 bytes

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