Malicious PDF — malware analysis report

Static analysis result for SHA-256 a499a5530bbc4b77…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 18:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 451be0a5db5d25ea8767e417fe9d06f2 SHA-1: 26948c92a1ebbb6f8e7b67507e2dd1005f07dba6 SHA-256: a499a5530bbc4b7702f111546c26110581e03825ecee93d4c66fb44bb89f1a56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious, suggesting a phishing or malware distribution intent. While no scripts were directly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=2+player+android+games+different+device+online PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/lizikixod.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2001b9ed---77333765229.pdfIn PDF document text
    • http://qzgj.cn/upload/file/lalepidexorakusejiluv.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614277d5dda9f---58788233119.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/wenojuneviditibi.pdfIn PDF document text
    • http://thecuriosityshot.com/69393327733.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/46192317836.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210918202503686041.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_0F50A4851BD42719.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/3481159869.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/97002173119.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/gonoribewuriripokex.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/62602999513.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/9775508715.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/42435591180.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109120112208746.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zilodap.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/mupipuwi.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/vutivebadoriwa.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/fuviwajozagabe.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/95625787410.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/91009642182.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/60408081387.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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 11168 bytes
SHA-256: 68d2c34b9cf29456b8db1c3896ba7253ff33df12e35429ca89a6b7492b8cfdcc
font_01_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 15264 bytes
SHA-256: f64e92bfccefaaaa0c8e6c69d141edbdbaa3a725b776e55deb75211f60051640

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