Malicious PDF — malware analysis report

Static analysis result for SHA-256 475ac7db22711512…

MALICIOUS

PDF

67.1 KB Created: 2021-09-12 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a6bc6a51f2c35e804556d3d839fe670d SHA-1: 0b5c4786a5cf9e786e5fe096d912998eac43ebd8 SHA-256: 475ac7db2271151271e8cce7bbe84a0b4ad940a40201d9f1ec5471f338f6dfc0
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. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://autoset66.ru/admin/ckfinder/userfiles/files/99692263856.pdf In PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/10195985266.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/4061229638.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jogalari.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/pilimebiw.pdfIn PDF document text
    • http://levotst.com/uploads/files/fojobofipumex.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210909_B500B6929B58229E.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/filizowis.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/40291848701.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bezixofijexovawe.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/19120341386.pdfIn PDF document text
    • http://bamor.org/userfiles/file/75288155387.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/31218545239.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/58138131505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=install+beetv+on+firestickPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA928 10576 bytes
SHA-256: 6e3ac4eddfc072e32b7945e186f80dff3fbd612ea8f2dbc20fdb8c60c69962a8
font_01_sfnt_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 14936 bytes
SHA-256: fcb216dfca56309133ad05663d0c1e0c66ab43546bcd4ebfe22f098f0870a5ea

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