Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38197f1cf29b3e5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 02:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48e8ae1e5c065c8679cd71693cddf619 SHA-1: 7a827975bab9d84c45f08a1d21b3b0789b6145a1 SHA-256: d38197f1cf29b3e59e6eb279f9af7c20c0d4ed502f8da29ca5d208b482cb088c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • 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://hattoco.vn/images/ckeditor/files/lixibugu.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/77710251742.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/kesexisodowimatetuma.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/rasakiwexovidetiloz.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/54318041067.pdfIn PDF document text
    • https://aayams.com/userfiles/file/feparexurolezog.pdfIn PDF document text
    • https://electroagro.es/pub/files/tizidivotujosawegigugun.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/17666254835.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/23983633376.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/348882392613de0f5ec58c.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_032949.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b73e05052a6f4fb016d89d04d10fd8bf/girofufubafo.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/455738472.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/sudivojaso.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/40154478958.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • http://hotechike.com/files/files/woladixizorewabojawu.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/94029186763.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85068977500.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/toxowilazovojemuna.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/57067416820.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/28540111898.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090724558_849263729.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140807c26107---48448760725.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/83762281640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mejores+calendarios+para+androidPDF link annotation
    • 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 19024 bytes
SHA-256: b227dfa256de0081b66053538ea887eb9a090e26e93f01aa9d23f7691cd63084
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 10532 bytes
SHA-256: 4b7c7c1a822f2a18b2e1630a4af746a5fb94555c342208f09f196ca6c871268c