Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa2eedca71f3ae9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 08:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e806e0ca0f6c3c8c4ccdb32e059bcb7d SHA-1: 1e933a31c42963f4d652be534583412732f0aa9d SHA-256: 7fa2eedca71f3ae9144e67d5418e1a5ea5f623eb9488dc1111c79f874487c5a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=wifi+master+key+mod+apk PDF link annotation
    • https://sma-dfgg.org/site/admin/file/31183745315.pdfIn PDF document text
    • https://haidangpc.com/contents/files/39293743011.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a23e91a70a---jamonedotebigibodiwevi.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/30556667988.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/14122348873.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jinakiwuporekovonegu.pdfIn PDF document text
    • http://samtekelektrik.com/files/balek.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dalanosuzup.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/88071325687.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/notaf.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/16297342574.pdfIn PDF document text
    • http://domuran.pl/files/file/gazagovevofutixu.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tiboboxavutisuron.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/24518088340.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wadufikekevebabek.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/gelipeli.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zawokaladusomunojon.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/112303355718.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zuzawosoxiveguvefuzat.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95518483400.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/59319940121.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dagovibap.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/30487155264.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/91330071460.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613666fd1dfed---nirefakapedumozunotepub.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_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 10708 bytes
SHA-256: 7b4386433cfd984e774ecc6e427e44348364f0df6051f3fc549e190f827fe6de
font_01_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 19532 bytes
SHA-256: 47c754c82e71c1659a968d0469d9fb5319b5e7fec517cbe387bd2c6f24d9bc25
font_02_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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