Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4587e6a7877c5ca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 08:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85e1695ba285837a76b8a0e1b732d512 SHA-1: 9cfe6658b90e2e4392d9830cb6d8efbde65c6405 SHA-256: b4587e6a7877c5cad1bca1d83c3de3e6e49b4d156b00ad01bc1c0f6adf8d19e6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external links, some with UTM parameters, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=ammonite+2020+movie+watch+online PDF link annotation
    • http://cctsw.net/whly/up_files/FCK/file/20210903_145240_167.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/92586071809.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/juwatojowevemewufenuti.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padadatimiremivufepu.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/88358865090.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/94242021434.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/lovijajuseruf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f987120f95---34309745426.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/wulevikipezu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/97239689370.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090702013770554.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wugetigozenonodiwakowom.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/92757943003.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nejofadabifep.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gemudupudupesofemowazemuw.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d78a8e369---wemozuvawij.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/toxisiziwomusok.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/gimobulusaxawesirifulo.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/51466217488.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/pupiregumijelevesami.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210902_010607_116.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/9829462297.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/62485424232.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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 18052 bytes
SHA-256: 66e1ff51a0a5b0ce281073b62c495a701fcbcfadb949fe55b1b83860e7b6dd90
font_01_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10600 bytes
SHA-256: 077c417915ec8225b98bb5c7c8bc49e0ac5b5f249028fcff052cfee69f5b5eb0

Open this report in the interactive analyzer, or submit your own file for analysis.