Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11f0cc0e27dee92…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee96b3b941ec2bf2dbeb64f438558544 SHA-1: a380d7a3b098f625e4bd5808b990c41ffa81b2e9 SHA-256: d11f0cc0e27dee9290e360f9c00cc5240786c2768d47093ce35a13700c28beef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosts and exhibiting link farm characteristics, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and contains no readable content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161351288f0843---kedaraxiz.pdf In PDF document text
    • https://malinaionescu.ro/userfiles/file/15247100363.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/posonomotepuvobaguridov.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/kemiserezudekamuribavune.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/7019550205.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/dimudix.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/16556881540.pdfIn PDF document text
    • http://trubaopt.ru/content/file/97480839909.pdfIn PDF document text
    • http://skisun.it/userfiles/files/vufugajixagem.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/jiraxinolumita.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/33758275941.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/63d754ac5071356add7a0e995b5a36fc/36289972451.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/70637495162.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/14864200886.pdfIn PDF document text
    • https://toocapen.com/files/35342240358.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090901255973499.pdfIn PDF document text
    • https://hobbypet.cz/files/file/78795615239.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/23290653123.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/77634951442.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/direwopujawasagu.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/30455338392.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/34353750466.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/vipanugotel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=live+wallpaper+for+desktopPDF 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_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 10588 bytes
SHA-256: 77faad591bfaf3812392227872285129ee89ad6285271273e4d055545475d1cf
font_02_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 17160 bytes
SHA-256: e31e7e10f6cad2a1e58479cb4499bf26e4c26c43545ca28919dfcbd5add9b235