Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb65bec4e660bd51…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 17:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cc6a3c093abd2f7179adab04d12f7fc SHA-1: d5c6bfefb0b47103a0ebf688b6e6dedf5ea80728 SHA-256: fb65bec4e660bd51bd53cba78301dc483e68ce6b936726937d139badbcc4d32c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to potentially disposable domains, suggests a phishing or link-farming attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to compromised sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/39182136450.pdf In PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kugujirinepi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87588979077.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/pasif.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zejiwaxofiwaketo.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/62908835027.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/26944097116.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sogikebunifomus.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/47674657771.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918103847.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/12941951219.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/76292229411.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/98077925869.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/562df87b839ee8163d08a75878dec2e5/72547655057.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/40994380546.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210905050151.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/56913545152.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/86437949874.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/88091565449.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/3914542958.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/6325167555.pdfIn PDF document text
    • http://abnicum.ru/files/file/nifoj.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/putinebisibiwabokide.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/167355810561343bb45e735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=works+that+start+with+kPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 10096 bytes
SHA-256: 7b16c65c4219c0e029ede8a80aabc8d803f39c3d6eb221d5c8c820c3822c02c1
font_02_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 14940 bytes
SHA-256: 9b79cad0a61da31367eac14b74e29d4a4d61009717c0d7dbffaef7e3e1373ad7