Malicious PDF — malware analysis report

Static analysis result for SHA-256 30150ac70f73db15…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 16:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 019861f7e1ec9322f71da123023b23cc SHA-1: da64e8e3b8d973a6b4d7b3bb5d38623b5175ed1e SHA-256: 30150ac70f73db1536ffaf7de304c0eead0aec82d1671cb7b08628c7e55e0aa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for SEO manipulation or distributing malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://shrlie.com/upload_fck/file/2021-9-6/20210906080029818074.pdf In PDF document text
    • http://dzirerealtors.com/uploads/japedekokiwusenofedi.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/fajefomamilebu.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/27408324988.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/80353027033.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7244b797---kijotel.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76982611270.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/35413661088.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/lemusejujamujegonedizus.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/puxebidifetawe.pdfIn PDF document text
    • http://balalajka.nu/media/fogozowebinibatokoto.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/fejewakuriratewabo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/29713115492.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/wexekanipufaxasejivamifu.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/juwubewage.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/87839638787.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/puparusidapisudibasotuga.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tedurerirujejugimu.pdfIn PDF document text
    • http://nktrading.qa/file/files/belazebewolivukobewisovo.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/52457081311.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/40253085780.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_BFBEE0E17794836C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cool+tv+android+downloadPDF 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_off0000ad31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD31 10124 bytes
SHA-256: 21f9d99ed612d725933dd8b5be009f6cfff2de91046c083461713a71571898eb
font_01_sfnt_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 15744 bytes
SHA-256: ad5c74f380f93399f83353a92cc83d01a5b005f03bcbc07601b268b7292ed1e6
font_02_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1