Malicious PDF — malware analysis report

Static analysis result for SHA-256 2151dd666d07b977…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 11:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 599028a4686b76906b2d9557c1773bc4 SHA-1: fea0e4df52b2f4e42df76864f58842450532c6eb SHA-256: 2151dd666d07b9770a42ff374c8e60aeb5e90ff95a968099191cfce6e7ce3f31
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1056.004 Web Browser

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or session tokens by tricking users into approving a multi-factor authentication prompt. The presence of numerous embedded URLs, many pointing to disposable domains, further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://karinameal.com/imgdish/files/22365434651.pdf In PDF document text
    • http://hoadon-dientu.net/images/files/kuguratavujamanafumo.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/68050356478.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27973203756.pdfIn PDF document text
    • http://poultech.net/d/files/zobigi.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/mipolu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/61719408348.pdfIn PDF document text
    • https://superchills.com/userfiles/file/67104943009.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/xisurinuvorizujidazifaw.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/rajupejufatopivivovu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/pazugezemaxifapewedal.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea39bae2f---32659590304.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210901145622_851402142.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/44790113936.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lakimuxerujidofelikefab.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/fuvojugodupewowizidoponat.pdfIn PDF document text
    • http://tion.hu/upload/file/3978551974.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/selivufudugag.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/14179309803.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/48772918394.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386bb92ea86---26472958195.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31624155249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ivms+4500+onlinePDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 18676 bytes
SHA-256: 1f3f386199d1baec792acac6a2b8190bd7155e01996b8141e1e3940bec60e850
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10260 bytes
SHA-256: b94c3ba36920e2bcc61cdb24d982634b1992f67512c32712f692218ac9818d55
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1