Malicious PDF — malware analysis report

Static analysis result for SHA-256 decba5a5f5624710…

MALICIOUS

PDF

83.4 KB Created: 2021-02-13 17:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 960fc9da67fcda6988fddd53fcc6df59 SHA-1: 0ae06c6b826cdf8c4f4dd169aae338aa262f2691 SHA-256: decba5a5f5624710e035bd9d57666d06542cb02389db0c2c6d0cdad5721386ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/aws?utm_term=atorvastatin+davis+plus+pdf PDF link annotation
    • https://sapukivuzenofa.weebly.com/uploads/1/3/5/3/135341545/puboxosobad-govorumejojot-vobepufos-sozibosobituv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fda68bb8d272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_60249a7b489f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fe04ad8c4d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_601cb5252709f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5ffc2ff882b00.pdfIn PDF document text
    • http://criticcxck.space/fm_whatsapp_free_20194ford.pdfIn PDF document text
    • http://reduslimitaly.website/71686138692lkb16.pdfIn PDF document text
    • http://artyom.guru/renaissance_periodization_auto_templates_download6xale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd674c62006b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fd056d7da4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ffcfc2abb747.pdfIn PDF document text
    • http://thecet.xyz/34590944917q3teh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_6024264fc3de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489057/normal_5fef7cfb0a868.pdfIn PDF document text
    • http://mandarins.space/3585239332530vwl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_6001c0d02b908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xapijifas/foxopufejekadinage.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/definition_management_accounting_information.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/nezevikofinurumagu.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/mumakotowogogate.pdfIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 6872 bytes
SHA-256: 46c6ad6f5141016dd22db0e8b34242e49ef9b3ba32fdcc6cce8b0ed0ca66b897
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 5084 bytes
SHA-256: 039da450d014fe808fccf88dc430bd8c0f37cbb806cba8f8d4beca0cc41a9102
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10692 bytes
SHA-256: 536f1f02cf87929b6b1940600e63e11ddfb08041fd65118fd95e3dac76b3e559
font_03_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16204 bytes
SHA-256: 76ce4cc6c7e22cbea2089a555bbf457f8a8954babd0df44f223c0d0cab424010