Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a324ff8b4e9760b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 10:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80107d6bcac850aeff22150ca560b6a2 SHA-1: 81c28504c8fdb35b02c43607ddaa3f242d254767 SHA-256: 9a324ff8b4e9760b806aba84db27d0880ef3eb26acd5faa07f9fa63506a64a99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_IMAGE_LURE' suggests it's designed as a phishing lure, presenting an image that hides a clickable action. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=gogoanime+downloader+for+android PDF link annotation
    • http://dailyxedayhang.com/userfiles/files/bezimerebisisilenibupif.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tozanu.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/91709830924.pdfIn PDF document text
    • http://rsentco.com/upload/file/wasutovab.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gezamimevenemebigidegas.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/53274802096.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614650e2ab678---pilemupowazafut.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/7503662322.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/sinizuzakafap.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///28542162550.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/waragowasewuzavekufigetam.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/53115585581.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/90898595913.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/26950411002.pdfIn PDF document text
    • http://montesantangelo.it/files/files/lixefotitetovesi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/12996524859.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/87293857498.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/tologo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143035be0053---remetev.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109261459558003.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/resus.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/30375133622.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210917_001828.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/xexosikesibefiw.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/bipojixenebefiz.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/mirobefiwubigukupe.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/99382575897.pdfIn PDF document text
    • 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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 10556 bytes
SHA-256: 8fc2f028768b694c3bd7679e433764c042d35afff5c69a91a95c50c2905d2abe
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 14052 bytes
SHA-256: 2e5291cf115ae2df70a110e4de1eb717f5a98a2904f13c485a638deec2f3a209

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