Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f08d8176fbefda…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 20:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 513f2c1a75abb3f423668aadf2a946da SHA-1: 99340d81a40d63a31eb01069ccbcb3d19cd7859a SHA-256: d0f08d8176fbefdae2f501642b679a2d94c309d3a642bad8b595196ed79e8489
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which, combined with the image-only lure and multiple external URIs, suggests an attempt to redirect the user to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristics point to a phishing lure designed to trick users into clicking through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://tchid.net/userfiles/file/17236446902.pdf In PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/40773098564.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fopewusaperiwog.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/kunareku.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140eee77bafc---sebidur.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc85dc409---digutapomediviraride.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/rikobobi.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/javapewudemup.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/44114594244.pdfIn PDF document text
    • http://js-space.de/userfiles/file/20543634128.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/dididisojixejifepe.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/jadajitewazi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/gojovege.pdfIn PDF document text
    • https://onecre.com/images/content/files/30986642205.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/35314823137.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/17573210685.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/ritovodan.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/divigonakevomib.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/32819249922.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/gudejulakis.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/nirimixajajefereku.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/guwosabidajigat.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/27/file/20210927_063853_167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=moh+nursing+exam+questions+and+answersPDF 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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 11076 bytes
SHA-256: 00b5f2bb594c2f1a9d02160086ac5af4c260c40a5071748141c5933726cd33b8
font_01_sfnt_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 14240 bytes
SHA-256: 8d41c1513e19262c00da6f49520cf343ded5bd0aa1b9e50ecee4e10474c6b37c