Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b5b75fe860c940…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bee619fc288a431c6a4a19a63b9dcee SHA-1: 6162de7d644e264247026c25e4f56e41bd4855cc SHA-256: 38b5b75fe860c940605dca1a9bd83aa3d72b8153a6162d6f6dfa586b4d1427f1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links suggests an attempt to direct users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://thic.net/plugin/ce1/ckfinder/userfiles/files/21067061030.pdf In PDF document text
    • http://umrllc.com/userfiles/files/vujonobamititenunarubivad.pdfIn PDF document text
    • https://tigapilar.com/upload/files/9154817184.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/fizivitovi.pdfIn PDF document text
    • https://seger.cz/userfiles/file/76541971166.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/62670451833.pdfIn PDF document text
    • http://roocenter.ru/upload/file/93616190172.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/10766964460.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/72602118220.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/sobunatedipexanoruze.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/ganosoridadonakiwilem.pdfIn PDF document text
    • http://saint-party.com/media/file/84508747812.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/nepikopurubedivabigixiba.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/fesusususegewobibixerilod.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sazevigifulojotix.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/zifanulusokilevutodobajax.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/41994844358.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/87005671534.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nevobogasovemejuselu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090604275134.pdfIn PDF document text
    • http://grupophi.es/uploads/files/86551732348.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9624ac533---72902681018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=telefonlarda+android+ne+demekPDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 18132 bytes
SHA-256: d8d4d7eaf95baac5ac94a92a08a805dd56e88cf2fc7f46121978201c0abe7ca2
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10304 bytes
SHA-256: 2a309b4a1dd6723fd3885537938e05609ce389dd2b5f8f471b494e4893dd2bce

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