Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cc64a46d678b90…

MALICIOUS

PDF

70.0 KB Created: 2021-09-12 15:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa76476abc938e4cbdb2e25f45543f77 SHA-1: db1b0f3d8562abde3369ed8f312b292c50fc9c11 SHA-256: 51cc64a46d678b901529345371087b9aa3e551b370c3117149e9790a34c6455a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document contains embedded JavaScript and multiple external URIs, suggesting an attempt to redirect users to malicious content or download further payloads. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a full-page image hides clickable elements leading to attacker-controlled URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://vkts.se/userfiles/file/52637026814.pdf In PDF document text
    • https://daynexweb.com/upload/ckfinder/files/6787343234.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/89015980244.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/14711687680.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/posigokoni.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/18667375535.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33709961227.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/gexodasurusunog.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26311238839.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc16613622---21840569100.pdfIn PDF document text
    • http://lovesenergy.com/file/jubimomopebobusot.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/vanowapima.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/karifosugewinorinixe.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109062145238349.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/96139677280.pdfIn PDF document text
    • https://beaszemin.com/files/sorutadarot.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/63081128750.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/wesomesi.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/kawafepuvomorivitamefa.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/viwefugekebekalol.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lirogikob.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/lunumofokezafokebu.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/85493720170.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/livoregosewowokumopuf.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/jibuwiboxanuxave.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/guxazirotikaxakixatin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=clash+of+clans+gems+generatorPDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 14104 bytes
SHA-256: d9bceab8dd6eeeb206350abaa7af61b1652ae62850989f63ab7cb2c2a826ed5f
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10724 bytes
SHA-256: e3d290189c00d0403ff83d0f597449d4547d846f30090c476d961170645380dd

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