Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5166df8f8f7381…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 00:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f6ddb750fc40bf84fd56508db29d6454 SHA-1: f54b32038792184d27daa906941215b501df60a2 SHA-256: 4a5166df8f8f738145447c5f6ad86640a3002afeb2db64de8c3cb01da714f760
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=english+subtitles+download+srt PDF link annotation
    • http://metall-press.ru/files/68044355122.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/67207225135.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/larulitomuwotikewanufexox.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/waxavovoponikuxoforenej.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/moziju.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210911_D14F922B6C408D9B.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/60101465342.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/nizoguvifumotixaw.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/71467240187.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/51180074340.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/17651229261.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/nedidabug.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/40097471286.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/tefaxivizedixasomonos.pdfIn PDF document text
    • http://theponghop.com/upload/files/45123511760.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xaxagolenofo.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wulupubu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pudaloxusizoji.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/tufokawalazafelexow.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/9461607941.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4470765683.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/zejakuvuponotirazu.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/kosevarofexira.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/nuvan.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/99301550993.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 15840 bytes
SHA-256: 694647420db0eba869ce3f1da256db877d93b1d256f555317f156eaeaa43bfb6
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10836 bytes
SHA-256: e3cf55d054aaf92c4210b0bb1f5fb168b28c61d9bb8cd7da5f1fb65a637936e2

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