Malicious PDF — malware analysis report

Static analysis result for SHA-256 223cd3bf258a2250…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 13:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e121a7f2d9a940b380b136960c3d06c SHA-1: d3cc9930b5d4e382abe5011ddb93f0d2e2cf52ab SHA-256: 223cd3bf258a2250f9d61caec498707285e22b89bc51c364fde1928dfd1d899b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable hosting and appears to function as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=australian+doctors+for+africa PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161329a3450f92---35150893592.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/6835177896.pdfIn PDF document text
    • http://scsytech.com/upload/files/namifalilijaxeturidikegu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mupalobovezavinozetarob.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386a02493cc---giboligatozodoxakaw.pdfIn PDF document text
    • http://orlickachata.cz/files/files/xonurimovalulotu.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/26118402357.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/83445372203.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gejovesamajutap.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/57209954165.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xinukovixipe.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/13772340312.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gupawi.pdfIn PDF document text
    • https://sanidom.pl/img/file/34004908069.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lidas.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/kewelemujovazu.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/52907279556.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/suxixejegozaf.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/virekesori.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/juvosinisodetumeloziwu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tatokiliparotefipesewet.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13041736329.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_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 10416 bytes
SHA-256: 67d20cc9e5fe58ec36dea145ca4ebc180773290c7758c8392c9792e7f5e738ed
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 17276 bytes
SHA-256: cd563fe74c384faf82a3136ea257d5b4e6a5c61b2b33ac9b5091cc9dcfc5e0ff

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