Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ddccaba39c5e02…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 508b745606119d937ccda53016c20267 SHA-1: 4d3b26eade7df345b7b45b2ee1306d73030e553a SHA-256: 74ddccaba39c5e02b75bcb79b0ded82d92856d0b8314772839a59c875980d6fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gachbinhduong.com/upload/file/xobalotegujijenuju.pdf In PDF document text
    • http://baoveantam.info/upload/files/nigozaduridiweb.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d4d8d164a008419507e617592151f54b/90583573947.pdfIn PDF document text
    • https://togeltop.net/contents/files/busajezozikusexekoj.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/logisukoxejo.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/6464005881.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57105135870.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109082252462953.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/85138446620.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/77496382899.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/41240225832.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/kuvofewuxudinera.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/genarexun.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/kurisuba.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/duwepopi.pdfIn PDF document text
    • http://reopen911.info/media/file/werepisuzomunakaluxul.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/worolibusupomejuboramize.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/14454923717.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/47498041877.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29476637896.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mezodiwonovok.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567026deac---bufapesew.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/17851945327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=read+qr+code+from+pdfPDF 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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 10464 bytes
SHA-256: 66872eb4a76bb5f904aa1ca1ace6ddc3a46b3f0198bb39c9022c15ba24b959d4
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 17856 bytes
SHA-256: 37e415bdda26f24308e419b607d17b00ad400c6ed26e0df8568c414f7de2470b

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