Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9006b0fc646d899…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 10:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7582d5e57084bd1533c6f500e8097c0 SHA-1: 0f7ff0db1dc97b672244274096d1959b34c76268 SHA-256: d9006b0fc646d89981a366da355d24d85de4cba982025e74da18553e0b13a351
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-based content, typical of a screenshot designed to hide clickable links. The document directs users to external URLs hosted on disposable domains, indicating an attempt to lead victims to malicious websites for further exploitation. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 1 text block(s), carries a click-outward action, and is only 67 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://oniceh.ru/uplcv?utm_term=matilda+book+in+english+pdf PDF link annotation
    • http://catherine-massage.com/ckfinder/userfiles/files/9371909576.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/fusimunazunewosukebedaw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa11d7af4---vupukedezimado.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/26511963756.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/95576106812.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/bopafovoraxobo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36504013223.pdfIn PDF document text
    • https://redac.ch/upload/71851117808.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/raluwid.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bamiminalajebedabugo.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/49337709461.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/rudokifatefagugo.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/bazubizorolazogimada.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/21501527630.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xakixuxuwezeguwugexexo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58720248468.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/46763689863.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/15986338269.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/nupiz.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/89305402863.pdfIn PDF document text
    • https://norservis.info/files/files/mafadafemakawu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe2d16701---puzozinibu.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/99987231903.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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 14280 bytes
SHA-256: bb24459cd7851c6dcfc77ea70e6cf40566488cf68480ca085ace93bcdd7dcc2e
font_02_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 10904 bytes
SHA-256: 7a5c874925718a20d23c4651e8f3396d5dcee1b1ae6caa4da464a3470787c4ed