Malicious PDF — malware analysis report

Static analysis result for SHA-256 91514646448dc14f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 11:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14e20f7095d24b4cdd24822a48015900 SHA-1: 01373d5601c11b6bcda491db6f130807e29c20a4 SHA-256: 91514646448dc14fbe25a8a73122c33ac93fc399c7f72be114bfc9a9f69680d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The presence of multiple PDF_URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://nsk-nalogov.net/upload/files/91817206990.pdf In PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/rovenoxakanutuvilubod.pdfIn PDF document text
    • https://salwangurugram.com/files/23451005.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/73489852961.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfb77f873---sogozuluw.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dubidipizopobekibodaxavi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/75652772197.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/zopezefuduwexesipexog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5616724f---44682689010.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/58548192958.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210916055205.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/18360287116.pdfIn PDF document text
    • https://domilot.com/uploader/files/guzivixasizimotudegolidij.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/57074064897.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/fenodamixunojixupabexo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/ninulepewaru.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fea47c5aea---wufaropegak.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/juruzokewibabeduronatemez.pdfIn PDF document text
    • http://cke.hk/userfiles/76253907984.pdfIn PDF document text
    • http://hotechike.com/files/files/rejunelukelixirikevije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hairstyles+to+slim+down+round+facesPDF 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_off0000ac31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC31 16212 bytes
SHA-256: 929ea305f01ad69c8718d6964a4a6da55f0d246ee6b56c75e467f4496ccfcc8f
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 10928 bytes
SHA-256: 4da39282da98b5a42d7253758e7230665a229705a34c72c71d0acb4d29adbfeb
font_02_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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