Malicious PDF — malware analysis report

Static analysis result for SHA-256 55392cded9cf836d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 03:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 414e59a71f9e816f3f6221e14823ade5 SHA-1: 6387c077274a731a833f92397b960bc323539b4b SHA-256: 55392cded9cf836d3b505bc205356a99fd0843b1a978f6dfd4c6bb011d82eabe
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 disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=friends+reunion+online+streaming
    • http://bonezi.morefriendship.com/upload/files/45315333780.pdf
    • http://mydreamtuscanwedding.com/editor_up/31911272921.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726904adbc---72838538960.pdf
    • https://akapacha.com/userfiles/file/wupugajikorisuzuxebulo.pdf
    • http://capri.lt/userfiles/files/megatikenon.pdf
    • http://tolaniprojects.com/userfiles/file/nefubijudabofemetelikudu.pdf
    • http://decaldankinh.net/upload/files/15523710329.pdf
    • https://dpengineerindia.com/admin/userfiles/file/9959447825.pdf
    • http://vaonhaphatphap.com/images/uploads/files/zoziresesarajuxosewax.pdf
    • https://farmacieitaliane.com/documenti/file/98802936685.pdf
    • http://giteduguedesboires.com/userfiles/file/xifewebelalopotawizap.pdf
    • http://www.39koratmachinery.com/file_upload/files/44211706619.pdf
    • https://www.idd.no/ckfinder/userfiles/files/lapidinipilakanupigasuv.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/sozukejab.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/baxibijixolujakaluz.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/wijagibikebitoxajesulun.pdf
    • http://alotercuman.com/ckfinder/userfiles/files/18449995467.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/begamamimimapebanug.pdf
    • http://goldia.cz/data/file/nimegowugalef.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/92799471090.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8d06e90a---pevakokene.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/83763941467.pdf
    • https://thefertilizergranulator.com/d/files/46789006049.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e0.bin
c5d123f183620d760461e0e7846ab78d0935106a91ed5b0884ce0779257bcfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10668 bytes
font_01_sfnt_off0000fb10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16792 bytes
font_02_sfnt_off00011322.bin
95c39b19188a91da8ca71e3b2b2b54666d2442670b4e795e9f5c68096a290eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 18740 bytes

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