Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c41ba103b5a6507…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 03:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c485544541a5e86f765b7c764a6d623 SHA-1: 19aae3702b7228369844b6f419c53fc0adb32de0 SHA-256: 5c41ba103b5a6507cc8505726a8af52f8ac53ab394fab571e5a9bdfc2daa2bd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of directing users to potentially malicious sites. The PDF structure and embedded content suggest an attempt to disguise malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laptopserwis.com/app/webroot/media/files/wutaxiripulemuxed.pdf In PDF document text
    • https://siroyensao.com/upload/files/14708266087.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pogawozekaxuropaleno.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/bulep.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ketojusebanav.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/veluwekifeji.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jumemusiwuwafekituvifunux.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/31150240775.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/91343831679.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lekag.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zajifatipasejabejirasa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5e4e99f56dc822b8ecb85a7d6f37fe6a/vufajevakomivibimeki.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/bugunusefe.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/48503491281.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa16230c7---jaleloxelu.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/84188235494.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/kigibituvetol.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/35668718675.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bojotili.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/derika.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/41092542253.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/31512804716.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/44113519811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=discdj+3d+music+player+pro+apk+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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 11272 bytes
SHA-256: b96a2b3ebfd4159faebd6d8080b582572556ea0ae6510d14c85d994f03a6e23c
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 17040 bytes
SHA-256: fffb2ad563b00658dbfa0e29304c835d2f650fc44e0441557dbd84dab089b515

Open this report in the interactive analyzer, or submit your own file for analysis.