Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc841bc7d85526…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 22:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e65d3f5e2efab000df7213df015583cd SHA-1: 93e2ee4a8c8494398368cc2c98f424f1654de37e SHA-256: 7bfc841bc7d855260fe61bf4384b97cc38103197d34d0582e7d9cca4ee731791
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to obscure the true destination or distribute malware. The presence of a Google feedproxy URL with a 'channel 7 news app for android' utm_term further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://rqconsultores.com/userfiles/file/kojurapuxatidoriluwokas.pdf In PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/26085766633.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/13877028959.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/30814558281.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090974645_148584072.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/74622523459.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/66629671342.pdfIn PDF document text
    • https://egca.fr/userfiles/file/2161329251.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/72287152866.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/24753512724.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/24595490453.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/jozirenenupifuvufitizu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/58029345769.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/zibazitiwawusub.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/gexarixuvazokakijoxo.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/xesakatuvovatov.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/zitiwuxegaza.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/kamewabumawamukazezekub.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb3657063---53159352373.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5edb4538b205f574619a0d354f563226/53174143154.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/pipepejijamidovirawazeb.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/7661161743.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/22737027380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=channel+7+news+app+for+androidPDF 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_off0000adeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEB 10664 bytes
SHA-256: 686c16631418cb4381d7a311a33c022acf7a8e7fc9956673b05d85ee97a9c0e9
font_01_sfnt_off0000c65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 14564 bytes
SHA-256: f3ce8b5642782a21d5b16996e656da7d9fb71c8f7ad77b4a901c5cc8351365aa