Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91acd7e7d4874a0…

MALICIOUS

PDF

101.9 KB Created: 2021-03-15 17:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3b65745169090c7c3a63fdbe190b9a24 SHA-1: 40e80ade0fa243093326c650aae719950cfefc02 SHA-256: f91acd7e7d4874a02d96b70ac7915e3b359b43b4fa379ac64cb3924c1c5f9ad0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan payload. It contains numerous external links, including one pointing to 'kuzutuzo.ru', disguised as a search result for academic test answers. The presence of many PDF links suggests a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://kuzutuzo.ru/wix?keyword=algebra+1+chapter+6+test+form+b+answers PDF link annotation
    • https://cdn.sqhk.co/lixipadiwel/xqRcif8/opacha_mda_175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_6029669609be6.pdfIn PDF document text
    • http://sallehq.xyz/78362999121cv1kx.pdfIn PDF document text
    • http://fitness-ital.fun/noam_chomsky_quotes_on_capitalismv23m0.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hjrhcjf/save_the_animals_save_the_earth_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_603a249557acb.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/5hijclu/russia_car_drift_hile.pdfIn PDF document text
    • http://nebo-baikala.ru/patal_bhairavi_full_movie_3gpx3ss8.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/gegchfU/tewabeluf.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/BBPmgel/sanalixuzenaligoxik.pdfIn PDF document text
    • http://topfrag.rip/how_to_make_your_lg_blu_ray_player_region_freef149i.pdfIn PDF document text
    • http://fastnoutservice.ru/across_the_stars_piano_sheet_music_freeoh774.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/daselex/ost_beautiful_gong_shim_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/auld_lang_syne_chords_piano.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_903d652c46f94c8dac480e09c1d911eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukiza/alangudi_velangudi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/thrombolysis_in_stroke_guidelines_2018.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_efe9b99e7ab34dfc921ce9e21024d996.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/ion8650_i_o_expander_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/how_many_types_of_expenses_are_there_in_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/rafuwim.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_67e4a02a1afb473fb5fa1a47d92a5d99.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_9ce4c8f38f964e52a67c05788dccd830.pdf?index=trueIn 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_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 5856 bytes
SHA-256: 0b2903312e296c1f55a476fd48a4db7b6abaafff8e85e1a7d135014bde21a274
font_01_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 13640 bytes
SHA-256: 45f6971718f97295dc6dc55a855e62efd5119f5621c9dbe27c2e973f2a65532e

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