Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f386739956104c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 20:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e398624635d386c143b2c3ab165b508 SHA-1: c5160244781ee86f32708171336ceb43e8c47866 SHA-256: d8f386739956104cd2ccaf35df22abb2eacdf5d7d97dbdec32afcf6fef4ad6f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various PDF files hosted on potentially disposable domains, likely as a lure for downloading unwanted or malicious content. The presence of external URIs and a link farm structure suggests an attempt to distribute further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ipost.mn/ckfinder/userfiles/files/vafozevafitelokuveru.pdf In PDF document text
    • http://traviet36.com/upload/files/44450650841.pdfIn PDF document text
    • http://pasaru.com/upload/files/62385943606.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/75300684122.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/nezazovokivabemago.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sadaxusivabaka.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300ca7adc7c---vatabonajevukonib.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/64974622592.pdfIn PDF document text
    • https://aneri12.eu/res/file/wepix.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d087665671---vofigolipemujarut.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51032025249.pdfIn PDF document text
    • http://www.bash.cl/media/file/zuxilazitezonudufotu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/58024370902.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/xawetexime.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/47615985538.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109131502574409.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/datenujomibagasiwanerij.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/pajarupemomomawilil.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/89285569511.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/xevapitevidavepeminozosa.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/jobirowexo.pdfIn PDF document text
    • https://fond.ru/userfiles/file/52597809112.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/vamunaviva.pdfIn PDF document text
    • http://sungder.com/upload/73842260704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+diamond+download+for+androidPDF 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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 10428 bytes
SHA-256: 8c1341081adf433a7a78a54c98facb4a7344cff12611ad0030011c32c09ab313
font_01_sfnt_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 16408 bytes
SHA-256: 9ea7496c31266c3c820874259b7a956a7ec5cd3e4fec4ea07240f284af74ad75
font_02_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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