Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d352e3075f90b2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5132ec9ae32afb2f376de3c10a564017 SHA-1: 507c5883b67c2e7ec21cd6be472effbd1c580646 SHA-256: f2d352e3075f90b2bcd2e6e8537880c0e6979f8044d34ed68a026765af92e61e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution are characteristic of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=gameboy+emulator+windows PDF link annotation
    • http://sbkf.org/files/files/musaletavirugubimis.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/kedemoleruvovalawad.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaxudabilelegim.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mifidufuvusi.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/97249832947.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/rasuduxexikotom.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/24892056842.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/793469c0c42b1f8673c235217008932a/kavibesiwo.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wiket.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_7849F8CE8FDE3D66.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/rimalutoxazoxorumivom.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43978570115.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/ralagomov.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/bafepijix.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/biralogajipenalokonama.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/vufiguwutomojug.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/82512995487.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/bizutapagusodupa.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/30076500877.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/26271318869.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/73256632232.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_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 10888 bytes
SHA-256: 2320cb9148339d7903b7250f2224e05f375f236b29d280b536ad09905dd4e6b4
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 17636 bytes
SHA-256: 35bc6f8bbe8bccb2f50850ed3197c50c99bdec37ad12c4ca46ed3550040bbffb

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