Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05d517ba52f63c1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 06:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff4ef812e60acca1a77ac869c78f4356 SHA-1: 5d5a90b535045d1b9a94a6f76d2c85271dbebb09 SHA-256: b05d517ba52f63c151d6d5e541ef507a687749692670d15400c84e91e5de5894
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, indicating it is likely part of a phishing campaign. The embedded JavaScript is likely used to facilitate the redirection to malicious sites, which is a common technique for delivering phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=best+apple+keyboard+for+android PDF link annotation
    • https://godahoian.com/app/webroot/upload/files/72988307750.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210901223816.pdfIn PDF document text
    • http://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71566352235.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nalijomepoto.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317452d8f36---43895143175.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/16480721066.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/1532824376.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/1695440585.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/bojoxupebemu.pdfIn PDF document text
    • http://salwex.hu/file/dixudo.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/78315245942.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/94731544854.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/letunovanajepizevur.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/96988427825.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/zobamugirasusamanukexugep.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/zujitimevi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/82735672773.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/durano.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/99093061723.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/akcqadp19me2dpe1pnfcrcrav0/naguked.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/26415467173.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/672522020.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/78538807949.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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 10892 bytes
SHA-256: 5dcb4ae52f8c3b2995608a53d17d9ad5320abfe0a8416eca0cfb209e32030f23
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 17336 bytes
SHA-256: 1e22a008190f9e79ef42649e85d38644cd66be96db41ac69f9d14d66c2f4ac5d

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