Malicious PDF — malware analysis report

Static analysis result for SHA-256 468a69588aee5998…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 17:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12a65e5fac47a3310133c701a686ea4a SHA-1: 6d892e562650d2affc046a3b74fbe4c0c97dedf2 SHA-256: 468a69588aee59980abd08dfa50a008fa162f1499710fb2541dcf81de96385df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=chrome+jako+domy%C5%9Blna+przegl%C4%85darka+android PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2deaeda0---rexeveluwutowon.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/nifazitetotafulinetux.pdfIn PDF document text
    • https://uangraja.com/contents/files/43690889335.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910043044.pdfIn PDF document text
    • https://novitas.ro/files/vizakeda.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b559c1b251---lokuzivisufeluredovuwi.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/91057947164.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/giduzumanakafij.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77400737513.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bivuzaruzisutuwemifovesu.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/32877311687.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/muposidepejitevuxomob.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901202503_1990698226.pdfIn PDF document text
    • http://maksimetall.ru/files/kufekuwugimuvo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109080849537950.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210906_04CCAAC32D875B7C.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/42312646904.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64658784052.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/40568340328.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28402782913.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/zerusimozusurakivo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/32451502042.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/66027075683.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630959613.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109010828304910.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 17860 bytes
SHA-256: c365ff1456acd8520caff1cf30a6b3c94d07fa768b458a27c794b8b29973b3e6
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 11420 bytes
SHA-256: e82027daa7af0338ed83940bdeb9cfad40285231f74a4a224d3c1ba0e75e2127
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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