Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1c7150dbf574fb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-13 07:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd136864878e16b0d547bfea53aca725 SHA-1: ab682e120224a981d020f7da2cc46323bbbd1893 SHA-256: 6a1c7150dbf574fb93869fe374065bcfb77fd8d914e20723c93c894aaeaa7394
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It is also identified as an image-only document with an action trigger, typical of phishing lures. The presence of numerous external URIs, many hosted on potentially disposable domains, further supports its role as a link farm for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 68 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://camping-du-lac-dijon.com/userfiles/fichiers/13588448127.pdf In PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30494587337.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/verasevug.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/laxuminonamugiviluxokipi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a2af8a1---wepivazasewisuguxojo.pdfIn PDF document text
    • http://videlec.be/ressource/file/62208530947.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tojidetazixazufalop.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/bitidatuboxesupe.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/88057150296.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35dca2b12---mebebageribakalun.pdfIn PDF document text
    • https://bagstyle.uz/images/file/telosidunutuwuz.pdfIn PDF document text
    • http://rjt1.org/upload/files/94676854733.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vunikanefuketowepudun.pdfIn PDF document text
    • http://palami.by/images/file/pixorimokanete.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/45597576087.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dofirelupikupaxorezanafod.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/34368969670.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/90491325807.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/58028949838.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/65198409099.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/fapimulexekukezadudo.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/nelixojugubat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=instant+app+permissionsPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1410177468.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 10316 bytes
SHA-256: 8943c6f4b25e021c74e53390fd80a15f80c267e9b00bfe68b5693d2aee0436fb
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 14048 bytes
SHA-256: a0c91af261b00ac7fd214f08a30af90d0d9c5315b6e10f41a5ad212263208852
font_02_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1