Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7521bee4f29200…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 10:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c9e3a7c54a790ec6070577b9eabc98a SHA-1: ffb24ccceca3bf1f84a1b0a4c9dbd2987a81c77b SHA-256: 8e7521bee4f2920082d5ce549c0bf958bb8e4e5279569c0d4319d3a290aea380
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on external domains, suggesting a link farm or redirection mechanism. The presence of 'utm_term=adobe+ps+2020+crack' in one URL indicates a potential lure for pirated software, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://yasairamenbar.com/uploads/files/41067670676.pdf In PDF document text
    • https://podimercrm.com/img/files/xabitabasapuvifekilozazof.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905054734.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/44121578425.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf1657cc1---wasavobisi.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nererenuzabimotufuniju.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/83963475947.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/44870448749.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/vajisadakubow.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pexidixeguruk.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/92072869522.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/vedatixi.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/xevugusinuxibulawedariv.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/manexusumofo.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/dovofaseb.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/9557443417.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f31acc0d9---zikobekagawipurileki.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/burabedujadiz.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/62884707743.pdfIn PDF document text
    • https://soechi.id/userfiles/file/65276247870.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/tejujorosidalitonuxuvupov.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/11895427037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adobe+ps+2020+crackPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10620 bytes
SHA-256: b4ca6bf9d23c5a76c1eebf6b97ccf046cfe922093a8235011fa1e0f3e7f3694f
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 18420 bytes
SHA-256: d12a94ee392968193b5ee766f47c6c7b649a808e7a5f30c71dbbf07a4897bc1e

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