Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1003b76757108e2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a53d71849d0262bb995a93e2158d064 SHA-1: e43db616d4d1255bdde8a7a408514dab3a954615 SHA-256: b1003b76757108e27df626de90c61ad076b3c1a0046ee540dbe8eeea6fa2800f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links pointing to potentially disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://reguitti-engineering.it/userfiles/files/67450695878.pdf In PDF document text
    • https://serka.com/serka/upload/files/jotuxaxukuvufetab.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399a79d358a---77246960760.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cdb1086ffd9bd7eea3b29e57106b1562/97239057613.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/17979435878.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/10037517133.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/witegovoworapazokewuwa.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/komagumebiwirogesexu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/85057881710.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82478709245.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/69379138802.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/bifupo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/menijixizuxafetesog.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210915190851.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/zazuw.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97375997866.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/noxuva.pdfIn PDF document text
    • http://kaies.net/upfiles/210917074014532293iz5ro8.pdfIn PDF document text
    • https://norservis.cz/files/files/91265195495.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/61630542871.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zubaxavulabu.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/39711115400.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/lixumopikapofafij.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/37896940490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fast+and+furious+8+on+123moviesPDF 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_off0000b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F9 11164 bytes
SHA-256: 19175f183f3e51f07975504be32e965b8471da373ba7538c0b901a3436e33e5c
font_01_sfnt_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 15560 bytes
SHA-256: 86a9e8088a2c27266b7b8d7075f0aa6e0493e2d131385b7cae02be23ed49c209