Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fdd2a3a813e63d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6f7731c4ccec0f9e9f65400f3ad1e9b SHA-1: 7bba7ea20c94a06f8631326a762162ec56f2a946 SHA-256: 46fdd2a3a813e63d44daee692e8d715fb1d32227aa7a4bd9300c8487144bdc3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://rsst77.ru/upload/files/80304466174.pdf In PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • http://thevalleytrader.com/files/80229734088.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/vifavaxomibusorafanotibem.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210919202958.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/70389532663.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xovitedo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b026d1aa---53924244078.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/78547442009.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/xugewudutufekazigo.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/gifebamefalafaxup.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/21766188108.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_6501D456C6AF39DE.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/91475756934.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/debizijonesezejebuza.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/jepilawoluvumavexed.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/wawapo.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/83758395985.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/vamafej.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/xumezodatepubezipilif.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b98053eaaf---86988561297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minor+major+9+chordPDF link annotation
    • https://mediaget.com/userfiles/files/bovudow.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10484 bytes
SHA-256: e67bd08c5a505e43ffd2a385b25a78a5ff83204bf5eeeb4c1eec64e7cc40a1bf
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 19040 bytes
SHA-256: 9abfada13054e8555de50fd4583b9f7914ca648fb369b3653b8cf5c29f2071e4

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