Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2af5729b5bd3e3a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 07:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2dd3fda34ec37a4db0caf626ea61e69 SHA-1: 50d9fb609458bae7b656a334a7a30ae05c24139f SHA-256: d2af5729b5bd3e3a0af33fad2159d67e2b06e87f7fc2e78120a0e299dfc82324
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirects users to phishing or malware sites. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with known techniques for distributing malicious payloads or leading users to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=pixel+experience+plus+redmi+note+7+pro PDF link annotation
    • http://acm-medicali.it/userfiles/files/dofekanufokurujaragabivos.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/58644061730.pdfIn PDF document text
    • http://sayarbobinaj.com/file/bekep.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jeziva.pdfIn PDF document text
    • https://adikketiga.com/contents/files/40444433730.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/74900968006.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109060451197748.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/66885434147.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/86721390764.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/zadixus.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/nasapesi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137fee5a7ab2---40586683759.pdfIn PDF document text
    • https://cristalensi.com/public/File/45251100715.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58697521195.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38604396576.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juroxuji.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/90801128010.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/bizakesalo.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99637532835.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/rarexikopoxinedumegujodu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wozawazelenufa.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/pajolinolemopezopojukuf.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/95175655573.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbc706bc49---95837753667.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/97929814003.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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10768 bytes
SHA-256: d89b6195ee196c3627a1cc3b19621c1ab1d0446d028a8517738bf949aa25c82b
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 19712 bytes
SHA-256: 07d2886a8e86461706a914dc5451e451233217f859eb0464e45623c3f918cea8
font_02_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1