Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd671e1ce99b0c11…

MALICIOUS

PDF

71.3 KB Created: 2021-03-25 13:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f939a1a0a56a59917b1f0d187c1184a SHA-1: 7718de259c2133f69c0981839986e245d7c0ff1d SHA-256: fd671e1ce99b0c115213d0cf9baf491b0a6617928ee647373005579978e6cb12
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be SEO-driven, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=avadhanulu+and+kshirsagar+engineering+physics+pdf+free PDF link annotation
    • http://dress-russia.ru/sistema_endocrino_hormonas_y_su_funcion19nh9.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/iahtggf/ruburovojifuxajiwenenud.pdfIn PDF document text
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/nikovoxobusake.pdfIn PDF document text
    • http://reduslim-buy.site/we_make_the_road_by_walking_poem4ztu4.pdfIn PDF document text
    • https://cdn.sqhk.co/datisafapuv/gghZhhn/koveb.pdfIn PDF document text
    • http://myluckybet.xyz/61694528143idul5.pdfIn PDF document text
    • https://lopewibuwo.weebly.com/uploads/1/3/4/9/134903232/5978245.pdfIn PDF document text
    • http://dvestideyli.xyz/general_electric_universal_remote_codes_for_lg_tvlsf0i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5ffa64f602d3d.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/ibjdbjb/thumbnail_maker_for_youtube_videos_pro_apk_download.pdfIn PDF document text
    • http://govnososal.xyz/fpies_international_consensus_guidelines1bkgn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5fcc7eedef358.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/senodiw/facebook_account_recovery_code.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/77105773387.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/synonyms_for_the_phrase_survival_of_the_fittest.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_664469f9ea0f4b06ad32b5a33e72f43d.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_6c9b896f9c554285b4fee7f897f1e351.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/53376230251.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/41563151666.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_662e62e2012c46aeb98218a58e5711b1.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 5632 bytes
SHA-256: 90f084d7eb19dbfdd62af562b3accb08a648b19c957edb7a58b5b11543430fb3
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10424 bytes
SHA-256: 2a6980e997e2918cba9334b5f538579b0c895e72cfc107080134e90f41c1428b

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