Malicious PDF — malware analysis report

Static analysis result for SHA-256 d132f62c0d1fdf8d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 03:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 260ad266f84fd58c9209853f3a029a50 SHA-1: 8f666816677b902c2dadbc776cddbcfbcfe8046e SHA-256: d132f62c0d1fdf8db7b6bde0f84d539ae34f93cb41f342a551b3104448fb190b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to unknown or potentially disposable domains, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goksirlambinowice.pl/img/upload/files/lezomagojo.pdf In PDF document text
    • https://gbp.dropship-online.com/userfiles/files/61175967299.pdfIn PDF document text
    • https://gornjastubica.hr/files/8502750473.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/45999554900.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/nejor.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/molazoriteno.pdfIn PDF document text
    • https://csodamalom.hu/files/files/46636302947.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/78029398274.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/debanebefonafelajigede.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/rorowamagefonu.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/wezugozifinafip.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/vafupakowibebigibupaxedo.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/34395210778.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mabafiropobob.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/36549775776.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/9588541426.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/godawenidimal.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/88940067786.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/67907866930.pdfIn PDF document text
    • http://autovoda.ru/upload/files/48482022766.pdfIn PDF document text
    • http://01host.ru/userfiles/files/majokaligus.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/dusisoburipowegat.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/2639900011.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/79578145963.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/xedigiragubodeloko.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/pipigavezepetidubigajar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=arabic+keyboard+apkPDF 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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 10420 bytes
SHA-256: ec32220bdca926d754c8d4537a5324da2ffcf82838987381bfd1949a9a44a7ae
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 20328 bytes
SHA-256: 2fd623eb90f44132d3cd2ff3a5d297605ef23fe2a61119ec55114f08042aff0b
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1