Malicious PDF — malware analysis report

Static analysis result for SHA-256 a394c08d66d5016a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 01:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4953f442fec659e89a036fb87d99586f SHA-1: 1532a12d2679295136aae7bd91063e7fa765082a SHA-256: a394c08d66d5016ab014bb28a79bfaaad82cdce6e458bf10e2b8e94a78edb4ad
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 0.9998

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 https://leonvi.ru/wix?keyword=shadow+fight+2+hack+ios+download+no+survey PDF link annotation
    • https://vujoxopirolara.weebly.com/uploads/1/3/4/7/134701597/pefejovejunap.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/rebolidexoleto.pdfIn PDF document text
    • http://stankovit.ru/wemimakbwyv.pdfIn PDF document text
    • https://delitulasuv.weebly.com/uploads/1/3/0/7/130775658/1350948.pdfIn PDF document text
    • http://filemarker.store/rt-ac68u_vs_rt-ac86uawg64.pdfIn PDF document text
    • https://romasipunup.weebly.com/uploads/1/3/2/6/132681769/ripumopevade.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/tisumedos-xefonavofo-tororiguzazev.pdfIn PDF document text
    • http://im-marceting.site/dark_blue_denim_jacket_womens_outfito48cl.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/zatasipezeg/xudugulapije.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/razevutun.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_7d921412dcc84d9aa20f3902f1b29f5c.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_26c7e35841df4ba5a1a4e4983ac69e07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/inventory_checklist_template_rental.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/student_exploration_circuits_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/miwumovirexi.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_0bc3cda9537c4ce5b046386b14358ca2.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5836 bytes
SHA-256: 9274ac73db07cf753b6f89f468b374865a3ea664db5c699ab4f26831ae637853
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11476 bytes
SHA-256: 64074178b2685de64b1adda442e8ce42781b7ab52c7ef8833b279c4e5c82e255

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