Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5eb27861ee6d17…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 13:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94fcb192ab776a24f2b3085e2bfcccdc SHA-1: 3e897a62ea86f7a03cef6a0b8acac83014b3e784 SHA-256: 7a5eb27861ee6d170fe05150db3ec67090669b3dbc090b33a7dc6a2d077cddbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a high probability of being a phishing or trojan PDF. The presence of embedded JavaScript and a large number of external links, many pointing to PDF files on potentially disposable domains, indicates a likely attempt to redirect users to malicious content or download further payloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting a link farm designed for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://bctlorraine.org/userfiles/file/28652388040.pdf In PDF document text
    • http://foodchemsino.com/d/files/77574668530.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/98643805840.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/26972947141.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80845137531.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jakijuvojupuwur.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/23327769998.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/potudupa.pdfIn PDF document text
    • http://flirdining.com/uploads/files/9737181476.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5fef12d2bf4c9870a6f82cd8c9e37500/bowakarufeg.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vukalunepobivikigifoxeneb.pdfIn PDF document text
    • http://domainecomps.com/documents/files/zifinixenav.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/33979655284.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/57499923970.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nivubuxosemifogamixurix.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907181006627352.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/112199331.pdfIn PDF document text
    • http://p-energo.ru/content/file/87000382945.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/76134405677.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/luwalilizozelilarivukomin.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/95791604476.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/dulefumedeker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alchemy+stars+codePDF 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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 20552 bytes
SHA-256: e758cdb75fe16b973d011514f5b7d33251a0024963895c549891c8e22f8558da
font_02_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 10532 bytes
SHA-256: 5e54149e2cd086660e52f666003995f12c9cb10d1c0e0bf871658c5749f50abc