Malicious PDF — malware analysis report

Static analysis result for SHA-256 a763670a9043ac38…

MALICIOUS

PDF

77.9 KB Created: 2021-04-19 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9621513322fb84ddf3eb270a523607b4 SHA-1: 6814a2d1038e21890af5564ae29813c204787114 SHA-256: a763670a9043ac381600338a03a23964efc67f92cec3d2a042769abbb132c8a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded URLs, such as zajinet.ru, are likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=what+is+the+healthiest+salad+at+wendy%2527s PDF link annotation
    • http://tonilakifak.mypressonline.com/buku_bahaya_rokok.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/vivejinimimin.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jicshiw/monster_shooter_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/eCzjifw/last_pirate_island_survival_mod_apk_new_version.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/serogajugomiji/how_to_adjust_maxi_cosi_pria_85.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_3f2d4facd01a442c8c03364d03b263a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/btob_missing_you_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/advanced_itt_online_exam_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/pa_state_police_criminal_background_check_form.pdfIn PDF document text
    • http://jonesojawu.myartsonline.com/84999490446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18a6654-d01d-482c-9c22-3a377e1c0512/46644702792.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/73677939834.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/arcmap_overlay.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_35581f1eaf5a446eb0e6ec06697f5479.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90ed07c-9aaf-4846-b522-520f312f2dc5/99227687489.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_c8309ef5e1814269a49589d6e4df0d31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/10031422382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5bdd67-7ffc-4664-8557-b038a350eafa/41130720986.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_play_harlequins_kill_team.pdfIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_88b70f74c65348ebbb86baf17f1f2ff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defipedibe/tanuzumev.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/calcium_rich_foods_in_tamil.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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5060 bytes
SHA-256: b54cc582bb67ea5b22581f3982d6f8e90f93e86a440c71354098ea2a461f5488
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10884 bytes
SHA-256: c404cab75dcefb9599bbf3888ccb5268592f3ac6efb3ab2b10cf3192a046fa54

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