Malicious PDF — malware analysis report

Static analysis result for SHA-256 27232428e4faa8e5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 08:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1e94fda24a0195033f9bc9c71c362ac SHA-1: 42aa6a30eea9c92fc558837b248653cf82a498c7 SHA-256: 27232428e4faa8e525162d098d9e8944954121f2981974631f2b50722e84038f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely a phishing page or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=suicide+squad+2016+online+watch PDF link annotation
    • http://drukarnia-warszawa.pl/pliki/file/7791316797.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/bimezulikiji.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/bapebufafadobawazu.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/boduwonozorif.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/2456868611.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907131238.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/35764284163.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/14987965694.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sj1ki6ulgat4j91h6549u3j4f3/78222063508.pdfIn PDF document text
    • https://tmtteks.com/files/94267662998.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/difiguvaxovu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/40327902651.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/34701658421.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/tejozenulawesovosukus.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/95084221920.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/43137500483.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/33550009686.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091403280173499.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613875ed62052---maregefun.pdfIn PDF document text
    • http://labsshop.com/d/files/18461595908.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xiril.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/33821198049.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/ketebemomeropage.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 11236 bytes
SHA-256: c4bcf6bba2d1f5e9ec5ae20ba7863301606a1a2e00d1c4c6da4a9c837ee5c78a
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 19680 bytes
SHA-256: 8da81df41b9ae7381a692f7e6b937f0c6e3df95b232e998a662444c9ea09679d
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1