Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd0f498f8c26a5e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 02:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51ddddf67bf84335c28241345bedba59 SHA-1: e1ce624f0ac591c1b59b9cca92d71a2987606258 SHA-256: 8bd0f498f8c26a5ec7029302f4f33593cded4561eeab10e3f70d6f3daf47b448
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/41296265498.pdf In PDF document text
    • https://xtrafitcoaching.com/www/images/files/12444164641.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cc102438---72562382326.pdfIn PDF document text
    • http://moneymaker-gold.de/files/kivasokapaneb.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61537310832.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/jokumozedenemumogame.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86741159647.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/linekejekibakexox.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/090113032461.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/55971586260.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/99328093520.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630635360.pdfIn PDF document text
    • https://bawauang.com/contents/files/pasomojupolepemuboxi.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/84475468833.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109070058298521.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cnvua1kv94p6n0cjfra0jn1bri/xepoxaraxusezage.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/90802918556.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/lixanazewuke.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/84511464275.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/someroboxifigupunon.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/13105209334.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/ribam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+free+robux+without+paying+for+itPDF 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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 10956 bytes
SHA-256: 522d3298a700720d61c5588db1da4d68e2a038f919ccb21213b0499c66806fee
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 17288 bytes
SHA-256: 7557f2a950cd9a284292a2b866b8bb3e2e137fb2c87c622d135ff429f31267fe
font_02_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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