Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad22ba736eae8a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 02:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4df1a1ca6a28daf22edae4bafbaf89d4 SHA-1: 3f718715ef6c6b3286a926c2e7714092faf4e7e7 SHA-256: 50ad22ba736eae8a99c40a1474f8ff0097a67835de814241fd6bcfba35d76a8f
134 Risk Score

Malware Insights

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

The file is a PDF containing a link farm with numerous links, many pointing to unknown or potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of multiple embedded URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://candica.pl/ckfinder/userfiles/files/satejitudibulazunazorebux.pdf In PDF document text
    • http://imaginove.eu/data/Files/18096388169.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/79055980863.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/82090703040.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/32864850875.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/96650544346.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911105337_z0hr7i.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/rexiwuborerepigaloduguwe.pdfIn PDF document text
    • https://ikansambel.com/contents/files/26182644005.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/temozigetumifupixemepemuk.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/73294005865.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/53209806493.pdfIn PDF document text
    • https://asi-filter.pl/files/file/10856754830.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/63339706338.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/retiduji.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387407e8d26---vasajirakibagideridi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d2df4bc9a9c6a3fafa42dd5cb23c543b/vumanamafudomizerir.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/lulavoja.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/59659565649.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/bosojuromubelovo.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/42340432275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ultimate+hdtv+apkPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10332 bytes
SHA-256: 8922a6e78937164738f6afee22b4ebcaa5ea76dd90cb88e9f5c2b4786e8824ec
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 18376 bytes
SHA-256: c08fae8566a229872aef1e04620eae10320554da0223e37b5b1f19c88dc9c23e
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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