Malicious PDF — malware analysis report

Static analysis result for SHA-256 71344680bec7e9b3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 14:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28780fa5b207aa5aa95d42eb6553bce7 SHA-1: 1c18a07691cf24e276e31006c2e0dfc508a43e49 SHA-256: 71344680bec7e9b33a01d055f3c22c0b1ace59da635672eac4f0f37a0abc9a8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 http://ms-beauty.com/ckfinder/userfiles/files/86125395818.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a11e47194b5006e514c2f0b7ef035f98/wejaravovebarajolotu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/95292390725.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/lavegolibuvomek.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nuvugapubajewogidureseju.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/nuvuponojebu.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/dobijagomogegog.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/96450373211.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/68909718939.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/35122363311.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8921c512c53902f31b8366e57c03cfef/mosiji.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mufuvazanevetelija.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/nixojiko.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/69576386626.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tutipojumigujizazuvameb.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gikulenuko.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/tusuxa.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/96532077715.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/93470805781.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/rejafaxakenasowubur.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/60449030206.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tozujadup.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/26302197349.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/23455327337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+spoofer+for+iosPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wovevilizuzirafuzat.pdfIn 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 17108 bytes
SHA-256: cee2a8a404b184f93ea6f9dfcfe0aa258c6d6718733480009c36112aeced1922
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 10304 bytes
SHA-256: 1aaf1f0d713064021ccfd1aa0d3e5ac01e615397073f5bf648824a4f5bc8528a

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