Malicious PDF — malware analysis report

Static analysis result for SHA-256 6535ab1dc86b8fe0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 11:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1c64a41af3896e0e4f627985409997a SHA-1: 20066db0fc9d455ca3342e18714b859cc016a051 SHA-256: 6535ab1dc86b8fe0e11a2a310d9c0e6302dd5803b37a66d2e6f5e8772c9c1c9b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=old+man%27s+journey+full+apk PDF link annotation
    • http://gyn-ordi.at/myPix/file/wudivepewe.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/denomitogatina.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikivadalukotomolopil.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/70242011303.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aee778a5c2a412f6a1156378204781c4/48974679242.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/71564657808.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911095752.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/pojusenasivojiterewonamil.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/gegebenamefiluzemimuvedo.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///jolabelotad.pdfIn PDF document text
    • https://izr.fr/files/5287009098.pdfIn PDF document text
    • http://namdolove.com/FileData/ckfinder/files/20210908_23388CF1D2F2B035.pdfIn PDF document text
    • https://krusomying.com/data/file/wikikovisujeze.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/31289057334.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/73643216574.pdfIn PDF document text
    • http://skolky.info/foto/images/file/53570794926.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///meram.pdfIn PDF document text
    • https://promise-land.com/upload/file/68925585374.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/47291358618.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/36282496704.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/14361182093.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pepezuxutepabonam.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_off0000b95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95A 10964 bytes
SHA-256: 9e4f06952c7f55496373020475b8fba4787ac3fa50dd94555ac34a7b9bd3eaad
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 17120 bytes
SHA-256: c52664f9d2bcd6d2e703bc4bc6a1e2743b47a18aadc8b821f2b0b70dcd3f3525
font_02_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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