Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53655c01e88516d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 03:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f55f14163c88fcbed06044684fdd2fcd SHA-1: 26cf83ab351aec6badfd90f2a0502de2b2d4e960 SHA-256: e53655c01e88516d13869fe2e8e63d267db452f0c75f5e91feadd60fc990a979
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=call+break+multiplayer+mod+apk PDF link annotation
    • http://vidiniaibreketai.lt/userfiles/file/97362005130.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14861351972.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/funusubas.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/wajitelesadisogigagukorim.pdfIn PDF document text
    • https://ratosatu.com/contents/files/93016395985.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/20933913828.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/80481508092.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/49868963583.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/44220816270.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/58617830928.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/51409040978.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/22613475062.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/dabafupetirilenevavi.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/91441209272.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/depuzilafim.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/rigereridezu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/15811991644.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/medinalamuwi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d37416db---ripazani.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/52259304848.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wifuvujopixolarik.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/67834835498.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/nokiganerowe.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10756 bytes
SHA-256: b14ccc4920159b9465f9d69b900f87499322db89cf9ed690a0c64e45ca3b2bca
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 17052 bytes
SHA-256: 9d9bcc4603b62b3c4788bc25be43f6bbd2f1bf3e993da3c0f28f80bb4e5c00d6

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