Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c099bc9bf3bad69…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 01:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c53733b3f727ebd80e3c86df13ed0146 SHA-1: fb1f5b2bac08af037281f96f0ecd6b5a9801779f SHA-256: 9c099bc9bf3bad697d97a485a0086d3f8ab84a22e8905aa3c6896b521692ed00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or a lure to external malicious sites. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=offline+games+for+phone PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e78tu7kpsbm0fh5qn8cgu49qq1/dowevowusowavozuwusaga.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/34864428240.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/52881166274.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/15656854180.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/budunof.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/22257055394.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/vawejetabukolug.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/41336897766.pdfIn PDF document text
    • https://noventa.cz/media/files/file/11565061864.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/41685017678.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/pezekaxidukisofixulit.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/48702998958.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/84783708130.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/petitavifugi.pdfIn PDF document text
    • http://kco.su/userfiles/file/67651039994.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/duwevidixotopesolopokewu.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/ruruwijaxumavunig.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/nojune.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/lagavovizedetan.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/frjp21agve50l08lssiquuljfd/ripekul.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/93449998121.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/tufikutajupa.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gateratotalusave.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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 18620 bytes
SHA-256: 7218a07a80347cea056011da7f0d08b8f4a770a31b23d65bb2c08823fb82efb0
font_01_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10732 bytes
SHA-256: 79d048af5f8269feb990e0fdc6cf574117de7cde64a2a42b4f17f744d564c70c