Malicious PDF — malware analysis report

Static analysis result for SHA-256 683a7393d38f4eb5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 04:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: ee5e4ad360b77d83c4ea0b977db26fb6 SHA-1: 9cd5f42a1f0d1c5216935dc042a2112d4320b0c2 SHA-256: 683a7393d38f4eb5596d2b5615b8c861b9becbbbd6f3b47eda8f6743cbb2dd0e
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 0.9703

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://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/juforure.pdf In PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5953203006.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/jexelefazesupetuf.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wuwitamepu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/mutabowaki.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/89031950823.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/xepifabofugokemi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6543852653.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/19060772231.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/doval.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/15351270606.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zenoliketusutekizev.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/levepirenefekotup.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/37495575657.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210905_FB05D3B962A26934.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/toralobisatisadeko.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/44998511867.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/91748754281.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8027133---datebaxukal.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/39301779256.pdfIn PDF document text
    • https://soechi.id/userfiles/file/32917157037.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55656399065.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111721243224.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/wasam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=world+heroes+mhaPDF 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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 19968 bytes
SHA-256: 0be84fcaf309c9d7f71f4f689bcc0572b1cc4a0a38db27270fb1ff2e7262a4c9
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 10212 bytes
SHA-256: b08cd293b98e1c072382f37c54c39eb45b660abedeed89e07263af83e7166319