Malicious PDF — malware analysis report

Static analysis result for SHA-256 1201fb0c35037a05…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d783e7ff34c8ee47114711a2ba1a2cab SHA-1: 3f4d5492340cbc697eb516762e0f2e85074d5f9a SHA-256: 1201fb0c35037a055375f13ddc99d797840fe339b4386a874c25d1b8c99ed657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, 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' specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=download+free+albums+on+android PDF link annotation
    • http://snp-ent.com/files/fckeditor/file/7655048536143c50a21c63.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gowowen.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/56522023391.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/binupatipowerekameginole.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161459030c2168---rexapoz.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a182e971c---6353590972.pdfIn PDF document text
    • https://egca.fr/userfiles/file/65628981553.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-22/20210922160500854375.pdfIn PDF document text
    • https://socardan.com/userfiles/files/87716370595.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fujozuronirarafaxez.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/2270078475.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/kemipogobumurikos.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/30047813565.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36368763178.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/rezuzubedefowejego.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/fagoxegokasaselalorawesot.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/99735273539.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/setaginelilisoweku.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/josujelerov.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/mawegadimigezovito.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/23315552476.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210923_C96DADB9285F4CCC.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/70778102469.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_off0000af01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 14904 bytes
SHA-256: 14069ab531dc4b65a5d04ad67f99c608c82bba47cc2d439343b35ed8c5d3cf96
font_02_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 10744 bytes
SHA-256: e35ef83b9f5da4d150615e66fcaa7de5fb6881731c3af1b9c7d55e39b1f5f7ca