Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbae4131c1a19aec…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 05:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5d7ceb2cbf9b9593bb3214b5f033c7f SHA-1: b4150ee3e1ed3e08288e2d24741cf977850e2d06 SHA-256: dbae4131c1a19aec6d3760c3c8bd4aefe10ec2c0e798070e3c12c14afbd37b7d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=windows+10+wallpaper+for+android PDF link annotation
    • http://elma1.ru/!upload/files/xokozikabevagix.pdfIn PDF document text
    • http://canoeing.by/pics/files/kovazevusafafijivun.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dusisibivezedelu.pdfIn PDF document text
    • http://aminotp.com/upload/files/tanip.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/xumataxoxubil.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xolifuxavigapipajanebofa.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/7305875895.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/xusiwipukoduguxa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907072845152197.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/94799002915.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fdf2868d606cfa281805d221552aa74/77718696612.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614904246ee07---nelotakosazuk.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210919052348.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/36789859763.pdfIn PDF document text
    • http://limoride.net/gallery/file/25141412836.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/37383922597.pdfIn PDF document text
    • http://medica-brno.com/files/jesofafigezidavisomixaxip.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/99942788996.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/dabipidanek.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/4368302407.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/40446192673.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
    • 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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 10644 bytes
SHA-256: 5ad37cadfa1e1fffe38a2d25af0fc20921c686635156a922ef6ab36d88399002
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 17320 bytes
SHA-256: c117829de7dc7dd91d471cf5160134e5e6139016b2f67e356556c461431f91ae
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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