Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24257cbaa6a9bf0…

MALICIOUS

PDF

86.5 KB Created: 2021-04-01 22:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ce4d51c955585cc707818838d61e5a7 SHA-1: 51d02a39ed3d24816186b2d63990efe70c557e33 SHA-256: a24257cbaa6a9bf010b462fa6f49ec97606576c7f9b6d1b55ab2d8127aa49da7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pelibifir.ru/123?utm_term=sap+crystal+reports+viewer+online PDF link annotation
    • http://apparentlyopt.com/wuzedugapowanu4fs2x.pdfIn PDF document text
    • http://cleaner-inn.club/fifth_edition_character_sheet_app_blood_hunter9tgd0.pdfIn PDF document text
    • http://espaceabonne.com/yamaha_mg10xu_10-channel_mixer_with_usb_and_fxxz1a0.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/4771014036.pdfIn PDF document text
    • http://serviceforyou.site/pumakufidozkg1m7.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/final_event_in_men_s_decathlonkuhed.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/bafukorapuv.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/download_administrative_law_noun.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/lajixajinijizonurinal.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/34dfe448fa9.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/astronomie_dbutant2xm3s.pdfIn PDF document text
    • http://moscowflowers.online/76964246741xxhyx.pdfIn PDF document text
    • http://insurancesouk.com/how_long_does_ti_ba_ii_plus_battery_last2qkg4.pdfIn PDF document text
    • http://domavera.ru/maharashtra_police_bharti_question_paper_and_answera9yez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wupixufekijax/loderi.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/lg_g4_battery_draining_too_fast.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/nursing_care_plan_for_thyroidectomy.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/mitixipasezi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/jimasuni.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/email_template_creator_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/42862145221.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/shandar_movie_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/gdpr_policy_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/67004088632.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 5072 bytes
SHA-256: 965e551854fc04e46adf109d266d60259642c9b0ba13f6df2de7cc5c2e980df3
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11396 bytes
SHA-256: aee55dd1ba24291de5483f8a6783ab9cb1ffdbb87348ee2d13eef63def6af837
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00013d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D90 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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