Malicious PDF — malware analysis report

Static analysis result for SHA-256 de05d0b70917ac0b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 20:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16c5c806948d326d84d68c7a0f77789c SHA-1: d4c202f15f582a46807c4d669df614a480666e5e SHA-256: de05d0b70917ac0b1715a4ad72e70540aebc2f75676b617920f6893228d340a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=fundamentals+of+corporate+finance+3rd+canadian+edition+pdf PDF link annotation
    • http://nanoservice.cz/upload/file/derajuja.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/831695538.pdfIn PDF document text
    • http://goldmustang.com/files/files/8410588768.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109171522148143.pdfIn PDF document text
    • http://pjteam.hu/uploads/14217542574.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090708523647.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/45208329263.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lamafarivugupeligapagiga.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/keduluzexi.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jonugusikamisiwuj.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/gazujojeme.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fapevodizuxoderizodowoz.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/16774220418.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210915_F7A4474CE71C2223.pdfIn PDF document text
    • http://pronobile.de/catalog/file/kojezugoxifidi.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/51543299378.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nixumop.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/14964538422.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/66999236758.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16133b35c70172---26344706962.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rijutaxuxala.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_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 17488 bytes
SHA-256: 4952304ba32982b2e77a2f20d824d1e26d4eaebad5feef4b0bf6b71db54062d7
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 11028 bytes
SHA-256: 4969db2bb44dfb5435a84ebdd6de788f95532630e33c78555b6bf356ed83fdfb

Open this report in the interactive analyzer, or submit your own file for analysis.