Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec8dedb6afff456…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6eb8dc64d5f83962051b3f5523aaa60d SHA-1: addd9cdf874093f433ec397a7eae9b35fb81b76e SHA-256: 4ec8dedb6afff4568a546ca97308d53f473b447ec917a15250d8f1eab0ea0eae
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'garglob.ru', suggesting a phishing or redirection scheme. The PDF structure and embedded links indicate it is likely used as a lure to direct users to malicious websites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://garglob.ru/uplcv?utm_term=cricket+mod+apk PDF link annotation
    • http://okna-dvere-online.cz/media/upload/upload/file/22383649730.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/72891974004.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/31468842190.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109020803344136.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7375dd5274258b494edf79246cdf9efa/59959015986.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/xepilinumogajotixupi.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/50450039906.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///lujimevodoguwupinegusa.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59356354144.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/30804609955.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355813ab160---35729569626.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48326423511.pdfIn PDF document text
    • http://vpsystem.com/files/fck/17576728439.pdfIn PDF document text
    • http://topp.pl/_topp/file/78188780220.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/femugazije.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/67745620553.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3600221046.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/78636109576.pdfIn PDF document text
    • https://dafelia.com/files/zufakuxipobelirukimejar.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/42972341784.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/tufupekamafafirixa.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_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 10480 bytes
SHA-256: 8f5e93015cc5db9609ecbbba49f8ce4709088753d7524f50491260ca74ffd986
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 17524 bytes
SHA-256: 5c71b9da34f90dd07af63063e04a7fb39c7caa2449cacb4fece6306df36a6936
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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