Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8e47d056439d08…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 17:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7116a1b207370ddeba7e6403a253c5ed SHA-1: 390de3c378feeb9cc987b2e0289098ac66140e82 SHA-256: ef8e47d056439d08c88af920fcf17f2d74fc2f44697f1635bc643ffb33cf689f
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 0.9980

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://nujhimachal.in/img/uploads/files/befinubawugojawikeworujur.pdf In PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_210803_183.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wofutipibizit.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/watijowusina.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132066d03516---ziwijovezawukuso.pdfIn PDF document text
    • http://posuni.com/userfiles/file/30862828841.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/24081174946.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3fcff14378a68f9bf4316ffe67084fb2/39141501560.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/76611689976.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/66301599948.pdfIn PDF document text
    • http://steinemann-ag.ru/vojonosotemusaponaxagesod.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lukanemutojapis.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/zufafazitopefezofim.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/52993539844.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/lafoxanofukakulekugitosof.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/5629130240.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45442555158.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/jagufapa.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/kakovilife.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/niripanunilupixitupaguli.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/kosukobobiw.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/81822566841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+internal+storage+on+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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 17384 bytes
SHA-256: a7178238412a05b952ddca51bf983814107c32dfcbc9bdc07b2cddf4cc9cf96e
font_01_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 10608 bytes
SHA-256: 0d66b4ce1a344df465b08f27aaa2e450ed5bba1c9c0b220c0966313ae10a2bd9

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