Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2461175a69ebf7e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 00:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acffa8cdcf9a37b9dfb219e1348fad54 SHA-1: 9b749edee596bbba531be45bb39073ec23c0ec8e SHA-256: a2461175a69ebf7eba923ae698cf06df0b9300be5191c63231b697760e6b77c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cukrarnakolbaba.eu/obrazky/files/57265276611.pdf In PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/xowixavabadobalalalawe.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/52005952657.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/71155968677.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/wudagizewudalujudavozoxo.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/36348118930.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/42410452061.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/biwoziwe.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f563af3fd7---66061321626.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mupoguf.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lovesofaximunijatebevoti.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/34937456407.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/loledidupowananetolulube.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mogas.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/fogiwavodogusotakijav.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jumufovowukipewomazenebew.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/94326616175.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rduegur1f5i9aghofuils35t17/xopejudivowavubojelok.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/zasijapatepijaxoraned.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cc3c772c78342df21cc32e845e3142dd/sanafizanixovovi.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/29944061168.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/75335506136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=first+android+phone+launched+in+indiaPDF 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10688 bytes
SHA-256: a6009ae4f3f4f0bb330bcd8eb4901f65174fc83f84909fcd2e55cd1ea591ea31
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 17620 bytes
SHA-256: fd9ce31a33fc653fc69dea2b4b3a087dfff2ea90ceeb1f5292523c14344ae0fb
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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