Malicious PDF — malware analysis report

Static analysis result for SHA-256 eada444888a23fb1…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 23:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4bdb5aef482ffcee79c2bb6a3475039f SHA-1: 78c607224b73e9f7b208d6cc013f67894f3a3b3c SHA-256: eada444888a23fb12c31e7929511b9ec620395454f1cce525ed505a8f7ea7d01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://vigen12.com/userfiles/file/61726412682.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6dec20c---tekexokonepidemarifuravof.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109121909105776.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/38925394724.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/79905612491.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e16aceace---52417453374.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/zuwafoferikopas.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/kurusejazo.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/resifivefovogesun.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/visifidi.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/pamexibolumewewozuzi.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/wofamapukezifavon.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/57813501454.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210903095527.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/bisawemadofewi.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/37746173839.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/puxulukaxul.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/62324761836.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fupiwidulibek.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dobidofo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/wazapif.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/44724218944.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/xugomerexunifalalokok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=telugu+movie+online+websitesPDF 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://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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 15024 bytes
SHA-256: de0557741d0cf38ed39628889038bbb60521d018cec5570927d982de3d455672
font_01_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10544 bytes
SHA-256: 7734866a59f93c22b49097a5687322197b24881dadbf6cabc293c9c7425a0261

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