Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f4e14d70ad22df…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 04:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a04f0a2cc70a3dd87926cf3b0e02d670 SHA-1: c130a143dd8d97fac1ff0c0ee2d98a7936e3042d SHA-256: 16f4e14d70ad22dfb234054235d4fd6369e6b40eef971174afca0a83248cf17d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous embedded URLs pointing to disposable domains, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and contains no readable content, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/vaxetamazevalakupufa.pdf In PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/zipamugavopusebiperoxalu.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c04d21d3b---25351680232.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/jeroporiwa.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kabonajakiloradalegukub.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/53930453291.pdfIn PDF document text
    • http://cobmedia.hu/include/rexin.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/jibanumegunasek.pdfIn PDF document text
    • http://precisao.org/files/files/miriwep.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/loxomamem.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/92894101821.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kutonelikowo.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/befijiwumigure.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/vudoseketujox.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/napidumizutulosojov.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/37783845751.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/dumoradojifavelasu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/87175207805.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/53720202836.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/satejuzigugezupujipe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/mamone.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dosegegevifekajuwaj.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/56933404358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+ball+z+season+2+episode+4PDF 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_off0000b8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BD 16364 bytes
SHA-256: 6efa44f78dda409d76c31eded85103ab39cdf5878cc3f9e67f614f40767770ca
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10868 bytes
SHA-256: eb1c9b50789069b213d155b28237239a72d6a8f10a196cbbab860b0a3f875c05
font_02_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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