Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e74216058597c6d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 14:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a62206d2a568617dba3f1073ff23ba55 SHA-1: e798ce61e4f86fa36a6367cbb0c4c88dd49c6046 SHA-256: 6e74216058597c6df59421f753eec7d54771bbcc69cf8b3734c7227927d41f05
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm with numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zsdbiopharm.com/upload/files/62892433548.pdf In PDF document text
    • http://xatrbio.com/userfiles/file/kirojuximeponiloxubulon.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/nogagogafowazububune.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/gewopeji.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/suzujezajozitevajo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/82400713004.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/6762130471.pdfIn PDF document text
    • https://ka-base.no/images_students/files/pubikonisinotuviwetel.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kiwel.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/42692183350.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-14/20210914115356201508.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/44741958906.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/jasuwe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/35516837183.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/60768636450.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/54995218380.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f321c506bd---kenenigivixisadaved.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/67969840577.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zafuwepedipaku.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/pisezepurutul.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/xarokavuzateb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grow+castle+unlimited+money+and+gemsPDF 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 11052 bytes
SHA-256: 1715268e1f4f7104bcf6fe85bde0a9864a2a53d49579785760453392d5f4a337
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 18784 bytes
SHA-256: bcaa154e55dfe36c4f6286c1d500e5912ed7f23e1af6536186604adfc27f1409
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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