Malicious PDF — malware analysis report

Static analysis result for SHA-256 23790633f277fd47…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 10:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 357741746e52f19b1050a1c7b9123227 SHA-1: 7503c8b4e0437b3596ef43da2937386db60134ec SHA-256: 23790633f277fd47a6bb4c7026d6b30ea7e038907edb27bb471ff6b80fdd0aac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://burelomdo.com/ckfinder/userfiles/files/36038872747.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9add3330---xoxipegolerejigurofas.pdfIn PDF document text
    • https://songhongresort.com/img/files/poxovema.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/48824107580.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/23796502945.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jezaforidatutinoru.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a30b9c578---jamubuzapowididozezuki.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/97704097252.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/boxolegerebagesuxunitado.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/jukowajedexutadovu.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/36847512018.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/79114150600.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/nepofejatejiwasef.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/53060538920.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/xemekonuzidig.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/kemisikagarumojule.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/541787453.pdfIn PDF document text
    • http://kotolantopeni.cz/file/67724148783.pdfIn PDF document text
    • http://kammed.com/userfiles/file/98925266651.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/54200282879.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/57525272004.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mupigokolutuvu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/92607119943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+mobile+download+apk+obbPDF 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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 19748 bytes
SHA-256: 48defddb67e8d80d67e7ff2dac1636997ca0b1541835e50a973f1671098b4e9c
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10788 bytes
SHA-256: c89e5baa23ba2ab8cee15c1efeb3ef04513cc48ba07e0c56e7d4c880787b2a2a
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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