Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad91559d85f6a45…

MALICIOUS

PDF

93.6 KB Created: 2021-09-13 18:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d5cdfa43cda6ef010364419157f405c SHA-1: feea2ff01b2ef054cdc1ab0f7bae0256ce83b7e1 SHA-256: 4ad91559d85f6a4568f8074931d0e3f511c08f6e01562dee9f02690aa07e5d8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URLs, including one pointing to 'nomylo.ru', suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=live+net+tv+on+kodi PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab2e9d6be---rikalavefanoxasuj.pdfIn PDF document text
    • http://snsi.jp/image/news_file/37962353759.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210909_23_21_16.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/lamip.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210911222540.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/2522023231.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/fepopadeba.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219537327707.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/12715173737.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/3839426401.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tobazewefozuz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb10526374---zapaxosapenefuvaximidije.pdfIn PDF document text
    • http://cx-gl.hu/images/files/96707849570.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/86969516870.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/26526578095.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/14619339746.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/jagifimoleno.pdfIn PDF document text
    • http://asfalon.com/__files/file/fowolabilagotoxoledex.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/baramegakoxedibax.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/51579150880.pdfIn PDF document text
    • https://simorgh.it/uploads/file/21904125603.pdfIn PDF document text
    • http://yoron.net/up/files/pojedeberono.pdfIn PDF document text
    • https://termoformat.md/img/files/kalisikesadesukefiv.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/pubekojasufoneravo.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_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 17836 bytes
SHA-256: bb6518a45c2c2e880bd90f2a6154eb7a22227f31a14d3841de89fb41499dcef9
font_02_sfnt_off0001527b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527B 9880 bytes
SHA-256: d4efa2b93414941ad37540d19e144280f398bbcde07216a162312b0af7713116

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