Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e5a4ed59d42340…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 23:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70bda60cb24e904032e26f6b51bfcf25 SHA-1: 15895e3af29b1eeb5852796f32dfdb1d202ec735 SHA-256: a1e5a4ed59d42340273492a23331cc4e4b2e944ef465a234646e74d2734a0463
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics confirms the file's attempt to redirect users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=can+the+iphone+se+2020+have+a+live+wallpaper PDF link annotation
    • https://grandhotelushba.com/userfiles/file/sujorujigijaridokinobo.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210907084753.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86487014550.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/62692786194.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/15310723519.pdfIn PDF document text
    • https://norservis.com/files/files/39396492097.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163085065168.pdfIn PDF document text
    • https://almavilag.hu/files/files/96546759830.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/35123413799.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nudowakegazapewuki.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/65051046908.pdfIn PDF document text
    • http://raczcsalad.hu/files/64846750548.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/pofevafuvo.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/nuvula.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ladoxifivujopo.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/8104715301.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/77500205915.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/xoraroloxijotineraj.pdfIn PDF document text
    • https://uudanbury.life/files/file/temebuvu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/87450804659.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/gitekogukarojunegelimas.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/60208501559.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/62896033029.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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 10776 bytes
SHA-256: 1c58ccbd151d17e55a076d5ff9805188dad9ae330fa6090cf4aad8b3dbc2882a
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 18728 bytes
SHA-256: c0cedb45328cf10c05645de61decaad5cf541cf7756a64cccc3cd769fc5f0a19

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