Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f414ff81f171f1a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 19:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12759a2edb01f19316129d5f7fa840ba SHA-1: 068e68131416a35f5db5ba9d34862accfed60fb4 SHA-256: 0f414ff81f171f1a404f281c2a79dc33b2064d05d799ab321b9c8df9a50fe1e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links. While no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly suggest it's used to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rvhifi.cz/files/file/36940817722.pdf In PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/13634436460.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb763bf18---49265584648.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/37684132488.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jatiwokam.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/gisapowo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/6560707216.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vufavur.pdfIn PDF document text
    • http://wamer.org/userfiles/file/44372773197.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/7238524840.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/12679333327.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/78154934393.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/vasarivapuv.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/bitoroduputud.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/vifodatabodonolajunoxojun.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/sogajapepi.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/98354496142.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/xuriseza.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/zudipanotine.pdfIn PDF document text
    • https://ottopianos.nl/files/33047596517.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/vuxojugu.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/rukigeralaziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=why+i+cannot+download+apps+from+play+storePDF 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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 17432 bytes
SHA-256: ba08ebb6c34d19a2f90a18cb38d9c7ed297c15da6cf8b8f118129e66521ae222
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 11080 bytes
SHA-256: 8597b8c73709e3d3ddb4eec09e2d23f956c7ad661d71984b4be85cf49a725cf2
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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