Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a4256317a298ee…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8142781ee4ce75a247c0fcf6c587182d SHA-1: 496832e9bba7b956114cc355021841d45cc3d32b SHA-256: 71a4256317a298ee4e54925bea1e19e59c67dd02b22523f425f3e20f61edc77a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a tactic of using numerous links on potentially untrusted hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bhk-aindling.de/userfiles/files/22856382980.pdf In PDF document text
    • http://bpabv.nl/uploadfiles/file/wavuzufotof.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/negatepifakufifonefabij.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/71652462231.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/23516662901.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/jogaziladivosalefa.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jeniso.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/56025023418.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/25789477465.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/34207084519.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/35030395559.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416acabd145---20983416993.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/89661092277.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/36726154015.pdfIn PDF document text
    • https://onecre.com/images/content/files/nomomefafeboxesasakijaru.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/20875333535.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109041313564565.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/niruvazokikotitoluxoparo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/34869661818.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/38956138241.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/lijuw.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xoxawukajefeloboga.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/faximupitemoxegunik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pati+patni+aur+woh+full+movie+downloadPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 17816 bytes
SHA-256: 99a29233d0d0d0dcfc35ed07794be1b04a4d9ad64645c4ad042c806148b2736d
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10848 bytes
SHA-256: ed2f190b7f8ab519955a6ae72293104c89bd955abc6e5f055e97dd77d1143f0f
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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