Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b414e9927f738d…

MALICIOUS

PDF

78.1 KB Created: 2021-10-08 01:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6d753affa1390eeea02986bf398a7890 SHA-1: 3fa679c3a82c2fa0a695a7f57ff5e2f3cd56aad3 SHA-256: 15b414e9927f738daab7b220b573885f5694d240875a0c301dd31227f4500796
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ekransamara.ru/files/gibufiga.pdf In PDF document text
    • http://4chan.ro/UserFiles/file/88751003889.pdfIn PDF document text
    • http://erex.hu/upload/file/97178090841.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/53002032406.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5b2bd9cd97ce36804c964c304ff5803e/sidezawowumedewuwepiv.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/25731953624.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/16472543727.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/vebuviro.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/bewogekopokimogufa.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/61835049759.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/5715394482.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/jewixivewilusudez.pdfIn PDF document text
    • http://lex.tj/img/file/52276620473.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/73962604159.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/16514954842.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/wizomijutokipoji.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gaketelatumijakimixo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/41624893926.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vepagoseguwato.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee21cde8f---bunivat.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///28059973818.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/98776244313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=espouse+meaning+in+teluguPDF 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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 21444 bytes
SHA-256: 3327638461a818fd363b137feb822d9545750793a579735fd89db948b068114e
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 10576 bytes
SHA-256: db123830f1cf73c8cd1a3449e5476921bc27d85b8b89bdbdc10f5ddc60f02f91

Open this report in the interactive analyzer, or submit your own file for analysis.