Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45df78935e217d2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 02:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e246d0581caf896aca241dab68386003 SHA-1: 04b42123062fbe5e493e7600d5b6acc91773a214 SHA-256: b45df78935e217d2633b2313d1b7f3c9a61abe2c2147fd57263acedd748279ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded links, many pointing to unknown domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://forumhrdbekasi.com/webroot/userfiles/files/wifugunon.pdf In PDF document text
    • http://kramnyca.info/img/upload/editor/file/rivepaluruforemum.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/bosinepep.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zotamigolodi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/56577684304.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vimofiwujigesematobo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifube.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fimox.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/70527329237.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sinibibimibigijelukevu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/bosagomajefuvudetuditejo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/37239162142.pdfIn PDF document text
    • http://chinalabware.net/d/files/lubupixejadoxaxepi.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/10918283373.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338cf62d212---mebuvasobeso.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/funorodozubowiz.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/720211509.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7520bd2e---70666696005.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/24054875609.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jatororisawam.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/47999781957.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xikuzotepulemivunor.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630447025_da67b78674.pdfIn PDF document text
    • http://rapet.hu/files/29210462763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hack+someones+instagram+passwordPDF 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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 17992 bytes
SHA-256: 80b637f0d2c83b7fce00b8bfe590da192b0325f093900db9d456231a357eeb18
font_02_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 10980 bytes
SHA-256: f57200e249c106c936bdccf0d8704bf9020cd5a0d66afa786918f03742e3b096