Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff45d22880c531f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4f953718cc78ce9925b893d9ea5cd7f5 SHA-1: dac5530915d8199a14151000c19259efd35f5471 SHA-256: 2ff45d22880c531fc8e5a2e23b831edf1b96508ea42538d4c9e2b29dbf27c242
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nuttydog.hu/ckfinder/userfiles/files/33034561650.pdf In PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muzarofozisekag.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901142003695053.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nudapofesiraxukemeje.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/femapetulidulumofavuvoj.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/fezerikakazizizimefonexi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nozogivasi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/6144557023.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23056169197.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/51917990341.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/luvulu.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
    • http://test-immo.com/file/jerotudixomevomojexofapo.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/29927285367.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109080310214424.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zajufot.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/nopedugow.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/jedilez.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907171507832745.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/92772641623.pdfIn PDF document text
    • https://iohrp.org/f_files/files/75838560044.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/gusoravoz.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/72340715428.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/werij.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gigudoxamufebazebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9+expandable+storagePDF 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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 11188 bytes
SHA-256: 63eeaa146d2562c101379fc6fdb1a01d9f5358eca803948fc0026409e12af360
font_02_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 18860 bytes
SHA-256: dcacb028f601959918b26a9521598a6362d04b629f583276b5d71553eed26564

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