Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf8e471d7152b11…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01efb0addc24c68dfc1d02d75909cee5 SHA-1: c5c37e14a968c9dcc54069c22af15967e5d02109 SHA-256: 6bf8e471d7152b11e636e67040d5d792148b750b4817e0c6ad47f38832df787f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, likely to conceal a malicious payload from initial scanning. The embedded JavaScript and external links are consistent with this payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=how+to+take+password+off+pdf+document PDF link annotation
    • https://russiancosta.ru/ckfinder/userfiles/files/mupezugoziribojinu.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lakinewodawavumidi.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/81575360431.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/76118507020.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/20476724490.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/danifizisavaxamulolu.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/gelamenodadagepowativi.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/raxuzaw.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614c863939dab---2532100409.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/7465352713.pdfIn PDF document text
    • https://kimcert.com/E/file/16068309913.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/52961676775.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/76139883413.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/mowarexefizujodadowo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/282d662dcda38322cdbc176a9e49b4e2/gubowuresowu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/81358816082.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/40953662388.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/22638466220.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/tenoxuroseluz.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/wimizifujutobotitexu.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/87352912313.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/44778889743.pdfIn PDF document text
    • http://katela.net/userData/board/file/ludazakibibixiwogolada.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/jijolulomeruzosisiwu.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/majoruzijuvozipinizixisu.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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 10912 bytes
SHA-256: 7c85fd67f362331d6ca0adf2276219d592fda1baf93a0a39a013053c663da29e
font_02_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 17088 bytes
SHA-256: 0f85a533d0cbd8a2b177639f4a340039b67a26373d10bd894a497125353f3bac