Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ecd9e98717c414…

MALICIOUS

PDF

97.4 KB Created: 2021-09-13 14:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ca7e90060c30bcc87d23881b5117e42 SHA-1: 446e61b068d8fb08abd6cd170bf0c5ef656f3132 SHA-256: 75ecd9e98717c414b01f1e37be396110f6241b14a8b90f38736471d1cca9446d
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://delfosventures.net/userfiles/files/sifewoxitonewizulotuder.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fcb29d842c4bf98799e4ac4f264cdc0c/23415279288.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1285786839.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/82548853716.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/buzesomebosamurofu.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/rurufib.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391cf06cfa5---ronuxatusofeli.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/8497355297.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109100008278815.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/pafibafiga.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///10528242449.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/56403131348.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/34702505049.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/lazotikitisusogasuveferew.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/xitumokajal.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/sitinijapu.pdfIn PDF document text
    • http://tradotel-riviera.com/file/14505701044.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/gadozin.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/kaxevekiboxamuxefirixovo.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/65325159773.pdfIn PDF document text
    • http://ternovykh.ru/content/file/83224516569.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/73787499291.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613BC9661D835.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/xaxaramenawufusigegifike.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vitomavox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+white+rom+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10460 bytes
SHA-256: e888fba1d3fe1e453a793a7aba5801e491530276b4b9c4f2661b2d70cd09dd96
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
font_03_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 23708 bytes
SHA-256: 2d839110945205dc2dbd37df4daaf7e307e2d306e81125e651f524c358965ace