Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d090dcc944c26b0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 07:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec4089f103a700abe5e94efcd504b6c1 SHA-1: 420e47d8ff438b2e33c0e939eb8369f769d23802 SHA-256: 8d090dcc944c26b01707ae403728b2d0d94ed6712f28a8a31245578b5bf66705
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to distribute links from disposable hosting. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://dichvutot99.com/webroot/img/files/buxojipuveb.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/17435905108.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/fodaja.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/jukiw.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/podafiliwotimutolufoxex.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/suxowobefemesulafo.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/fofevew.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912015939.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/67101286069.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/20771246090.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/56856829200.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/liketagalodexidevutalesoj.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/zubusodofatifasosilu.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902202521.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lofivagepoxuduwitinizutu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1333edeca---46077144187.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/katuwebikasalinuwawese.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/12075272346.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nemobaguxanezot.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c9a9decc21e23afcdb4ca6dee8df78ea/xiteneximaxesawidowatibaz.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/zugusupovubesute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=itextsharp+html+to+pdf+inline+stylesPDF 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_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 18516 bytes
SHA-256: 2bf76a93cb0739405c0e8705a6c6e978534d9afaf431668f6ec53cc7dfa17fa5
font_01_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 10928 bytes
SHA-256: e8525fc146dd30d34fb920e7fd7400e00ae7b3624b5880d5e3f9e57d54d0d839
font_02_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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