Malicious PDF — malware analysis report

Static analysis result for SHA-256 669183ef598993b9…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 18:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d03ebb95e9a218b43222d3888cb5fd48 SHA-1: dbc786ea503292ad4bb53479168c20ba7d48bb91 SHA-256: 669183ef598993b94d7e0c0ed1d94f7df59e7f569c51d755f875b67da5d5f76d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=fortnite+battle+royale+android+gameplay PDF link annotation
    • http://dlzhrjd.com/images/uploadfile/files/46136601079.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/jeparam.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/48514229809.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/7525718902.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a5a4854---78923159082.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/bosizunupovekikizeg.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/mitapukotasuwu.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630781319.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/nobubidewisuw.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ronojamefatizajuguge.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/kafapodelu.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/xuxaxikekupuduwoga.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4d5156a3---57305283732.pdfIn PDF document text
    • http://rinsacars.com/files/others/dukezexezib.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/97121716935.pdfIn PDF document text
    • https://arerp.kr/data/file///wivevunorifuwisopoweruvej.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/mozeleto.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/84178266044.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/80433676530.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dubopebipil.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210908083103.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/50259069970.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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 20164 bytes
SHA-256: 75dfe550cf98e5f9f3efc257eee4844b60dcdb26342b2639f2327f8c4ec1a5a5
font_01_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 10796 bytes
SHA-256: 2b9264ab716331bf7b98ec43719c366d50544db142dfe37775173a94a4ea4670
font_02_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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