Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdc0c583f1d2c18…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 00:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c438a35709aaec99863d1a28cba30521 SHA-1: 47b08f6f893a8604350e7025993c539603d31a0f SHA-256: ffdc0c583f1d2c189ff1fdafb045260d690fba53bb2cae837874cf2f6d061118
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, suggests a link farm designed to obfuscate the true destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://futimisdev.com/userfiles/file/1965475571.pdf In PDF document text
    • https://mbamantra.com/ci/userfiles/files/99246037775.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/lovutujirulasaz.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bunewabitelom.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/33751109211.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/peridiwodarejatuwezol.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/35733805336.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/jenipij.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/kowepisinujesojizos.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/59537006259.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/geziderekagaxim.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/64b64bd2533e0d7fbc9ae485f75168d4/pagifapogunozamutinuwu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/65809147122.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401acfac07b---juvanojebixozinisuj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/78283494980.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/14998269053.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/burepisokodegeletin.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/dikedigolovelexokezo.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gifakiratuwogevozoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pes+2021+latest+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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 17952 bytes
SHA-256: ae676560153c59dc18fadf0ce58faea41a7410f81c51a3ab26bf3d604ae80c18
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 10664 bytes
SHA-256: 2d010852038b4a28e9dbbb8a7cd2ecd86c60ef0091253575e6c38306958b659c

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