Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9acbc517cf8214…

MALICIOUS

PDF

83.5 KB Created: 2021-10-09 18:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 59b7d6b4843fe29d70d9749885b3e3c6 SHA-1: df9851400a118b9037a52f6b16ccdae695036627 SHA-256: de9acbc517cf8214416b12e95daeb97f70862a9ddb64e5d1ef6add0e4da8e344
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous URLs strongly suggest it is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=what+does+cultural+stereotypes+mean PDF link annotation
    • https://thegmsbihta.in/userfiles/file/bekerizupitopunuxanuz.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/30142886342.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/kazuruxejurogovemumid.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wamuvegejifoviti.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/lomazovorupusironebufixuj.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/nolizulunifafif.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kikolikinokifat.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/84864630829.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/57131885351.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/fijizalinawaxijobo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/6694335451.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/75426480515.pdfIn PDF document text
    • http://twilaw.com/files/files/76134368379.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fokalenizik.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/nobexunijokodudubujipola.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/timejudob.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/46746287581.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/42505781477.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ba1a83a06b1ff9b7764934eb4634aebb/75311688219.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/47793273827.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/28313540562.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/jixesoja.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/10991719233.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/13827568019.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/533213643.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/74288816968.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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 18648 bytes
SHA-256: 398a6b0a7ccfa7a83c5f362a2305429f6bbd7a6f09e38746482e75531c038e4e
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 10896 bytes
SHA-256: a5ce4ff8f1e34a94fe4b6af06857de68d265c01c1a4b9e5d38ee5a2eb7ef6cf0