Malicious PDF — malware analysis report

Static analysis result for SHA-256 537dda30a3e36ade…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fe3c9f0100403dddfe9b219aa14852e8 SHA-1: 97aa455b9e289e401ffd82c50d48766de9f8e6a8 SHA-256: 537dda30a3e36adec49ed4d311e6108d8f7757036b2288c4562c72acf0033dad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file 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 disposable or unknown hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43084993e---watinim.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396a388ca34---pudaf.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/titivikubotetebokevagavom.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wuxagovezax.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nalelikivom.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nukasatug.pdfIn PDF document text
    • https://jss-moms.si/upload/File/nudedelipizoduposapar.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/90342311645.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/86789333748.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/30212713572.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/79406910700.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vimodosavewu.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/dowevobutos.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/2364816007.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96156263902.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/24294728772.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/90057012883.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rifavopolok.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/66479321824.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/78024958153.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/78024232346.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/82093597448.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/nufegapilururaba.pdfIn PDF document text
    • http://parilka.by/var/upload/file/bagoginibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beginner+guitar+songs+pdfPDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 10780 bytes
SHA-256: 9290e85e71d775ef527064b4672711601f4ffee39992953b7e5edb6e79abd55e
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 18536 bytes
SHA-256: dde99df1abebcb536809eba821e6a2687dd1efcd04eba588ca12f95a9de18e35

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