Malicious PDF — malware analysis report

Static analysis result for SHA-256 da998686e16388cf…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 08:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec1afcf23928396f608bbbb3d0ab625 SHA-1: 2b840f4e6a2cc6d101d99b0ea94d73ea1e96f5a7 SHA-256: da998686e16388cf8fd7d4cffcc7208cee0ff61399f9ffc5395b815cc64de497
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including one pointing to 'kuzutuzo.ru', suggesting a redirection or download mechanism. The presence of embedded links and the PDF structure indicate an attempt to direct the user to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=cladistics+worksheet+answer+key
    • http://harmony-market.ru/fotarugop7dkza.pdf
    • http://bunedose.22web.org/change_up_movie_free.pdf
    • http://instapriz365.site/marathon_csar_watch_review5h8s0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pozokimepe/sejozovamipa.pdf
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_6c24e94f854f42b585375803ee7ca3c2.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_15ce6792e5fe4e2782afe161d416e442.pdf?index=true
    • http://talaxapu.epizy.com/marketing_foundation_for_advertising_and_public_relations.pdf
    • https://s3.amazonaws.com/pokixovuxik/shola_aur_shabnam_movie_480p.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_2e9fe15930894a38b314f785eccb4e0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55023fcb-e786-4974-9e0e-291176dfa230/the_company_of_wolves_angela_carter_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/78ac3c5d-1a4c-4188-923c-b742c082226d/waxabu.pdf
    • https://s3.amazonaws.com/setigafat/music_score_sheet_free.pdf
    • https://s3.amazonaws.com/sesafefanulokam/how_to_set_up_lorex_camera_on_iphone.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/31007655562.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_40360654d45a48c38339ba259b1adfef.pdf?index=true
    • http://xumugipetoje.epizy.com/magic_chef_ice_maker_manual_mcim30ts.pdf
    • https://uploads.strikinglycdn.com/files/b4a2219f-5819-4e84-bd4d-227314d896f8/trx_exercises_for_seniors.pdf
    • https://s3.amazonaws.com/tufujifinobiro/21834989532.pdf
    • https://s3.amazonaws.com/fomudebipefasu/27055560976.pdf
    • https://uploads.strikinglycdn.com/files/74ca2574-2053-4617-9faa-a154cca6740c/saint_teresa_of_avila_the_way_of_perfection.pdf
    • https://uploads.strikinglycdn.com/files/1989acd4-c995-4461-97b9-52190d2faa4f/seziwurewepilazowawexazix.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_aab734b886ee4c84971052c6ed8f7338.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fb.bin
756590d00922deedd95c453cb21f701c167ec6a676f0e6fccf34cf08eebdc999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5188 bytes
font_01_sfnt_off000103aa.bin
924f542966fc35f5a930283496dfef11ea753e9e45e5625a6b0836a81fca441f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 11236 bytes

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