Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c66c100028d79a2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 17:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ec93b63db56c243aae24c98554212510 SHA-1: 5bc06c9797a88fdac8d046e53c2fada8755c2304 SHA-256: 5c66c100028d79a25b6972cee0b8a95e82eddc736a643174bdba9d9b3935cdba
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=fundiciones+de+aluminio+pdf PDF link annotation
    • http://satakantaresort.com/user_img/files/74570523011.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/vojena.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/lunadixomoku.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/defuf.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/pejivemorarutaji.pdfIn PDF document text
    • http://billsky.ee/files/file/1506463188.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/muzemovabosewejiko.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/7320428569.pdfIn PDF document text
    • http://sbairs.com/datas/files/noxigafo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161386e4a16385---28168505437.pdfIn PDF document text
    • http://beiks.info/public/file/xesegule.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/19507591841.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/diresegujebezumeziwum.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5339291c---tuwaxiwevibojarufiputi.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/75409284368.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/soguvafenitiragiwovepas.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fisorofovesonipomi.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/kufobonabavibulisez.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/53673233940.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/girepepepipijep.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/88867545949.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/92360774861.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/78881730286.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/10240601360.pdfIn PDF document text
    • 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 10660 bytes
SHA-256: 5ff3b9d8a28f955c8f85e3159dc2762931c0c2c034530168334cfa512e043aad
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 19804 bytes
SHA-256: 0a6d61146ff7cd5f8cdfd61416dbd99c873bb7b65ddecc767220fe9ee415c85f

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