Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dba959f01400b9…

MALICIOUS

PDF

84.2 KB Created: 2021-10-13 15:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a889b7d344b968d36baba9ecc7e6fe6 SHA-1: b26b6ee55f29a060ccf35b61d18f739898d4f39c SHA-256: e0dba959f01400b9a77aa564b5d03497f29ddd9fff37fc5ab814d1d710e8b1e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cn-junsheng.com/upload/file///2021927144618394.pdf In PDF document text
    • https://korovin.org/site/img_ufiles/40661656784.pdfIn PDF document text
    • http://jinyezi.cn/upload/lezabekupavopovolitovota.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/4009127603.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/37142646783.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/36053505765.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/63357049675.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/gevudapakibizonel.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/bogodapetuxev.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/venawosexumujotekirosikir.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/15778518047.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/fukaxugasokoputofab.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/7469089989.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021919523283862.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/sofeni.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tapuj.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/mepukujisedurebivemetuni.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/77880519982.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3884433f858850afcfdfc0e07984c8e5/28258881737.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/50541212042.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109261002206136.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/51081629607.pdfIn PDF document text
    • https://apra.pl/files/file/24990666105.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/82349744381.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/rusuwekumovefepotazagiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=large+red+blood+cells+without+anemiaPDF 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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 11100 bytes
SHA-256: 9ecec9a5998f1aef6e0bd1b8221f831ddc6848b1000f907d7432a6436ff46c66
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 18340 bytes
SHA-256: 8f005c1843b50a575fc4f3bdfa7833a2132c4885766b4ec68066eb5e3e6b43d5
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1