Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea751b42a84fad6d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 12:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 983ae7bdaed642fe9fcfbd01a6a60260 SHA-1: 40f1c7af345a00f77e931d8737f492426b690072 SHA-256: ea751b42a84fad6d2d3edce9609933eb0a785cd84ab2903c7ae2ff59e304b4cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, including one pointing to 'catamma.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=seven+deadly+sins+grand+cross+apk PDF link annotation
    • https://goodline.by/userfiles/file/71277448162.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19405597793.pdfIn PDF document text
    • https://shevian.com/images/file/pujegixonikuvemexug.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/nuforo.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/ropedirebipefafebalip.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba8a3ba98---bozixufumi.pdfIn PDF document text
    • http://viettruss.com/upload/file/47172128823.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/61647937135.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/79292673787.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/41823611880.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/94714924472.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/repug.pdfIn PDF document text
    • http://vipdiler.ru/files/file/dikedepuwarumipejagokase.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/semafoxiniwunabupa.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bilupiwilemekuxunaweguw.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kolasasunerug.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/87067920499.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449bc4e1296---lupumizejefu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zusogod.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/76361048498.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/jotigepaw.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/gulizogavuvigufoteloxer.pdfIn PDF document text
    • https://eventaipei.com/upload/files/67660684528.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_off0000b78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 15296 bytes
SHA-256: 8cf1bb24ebc04bab86db845bbe57f3c52a2ba7e6345e2d0104d88cc164565c70
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10940 bytes
SHA-256: c738f5b16932a03b5dde488d6e34adf51375eefa2104fd526c25892a5d4bae9f

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