Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b7c9bd7fb687bc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 20:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7990b1530fe0f1ed17f67fbb12fed8f SHA-1: 34525599e9c61953ae41bdc28577af1b6cf8f820 SHA-256: e1b7c9bd7fb687bce2215ee7832f6e9b446ec674a6432afc9245a8bfc884e9e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers also indicated maliciousness. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://pastadimatteo.com/ckfinder/userfiles/files/xixoruxawizomaxufi.pdf In PDF document text
    • http://olech-rzeszow.pl/userfiles/file/gomipopigosodoguxi.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/davigasomolaketo.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/30625826267.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/57863265843.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0f135ca1---15871300734.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/73236807627.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/53128605166.pdfIn PDF document text
    • http://poliinc.com/upload/files/ruwokubupetaveropadimiji.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zuxosowuda.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/58904420792.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/sixozib.pdfIn PDF document text
    • http://a899.net/userfiles/file/27739870483.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wujepuda.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/lilebelojo.pdfIn PDF document text
    • http://gibisch.org/files/files/lotam.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/sulusexabifamawanak.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/18221793035.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xururobeza.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/ferugazirulajebupejo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee858577972a1a9e65067f13df40f835/89986334278.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nazomozafemeverino.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/57382117205.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gudowikabuzesupurum.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wilirotidebegobumizuret.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sebaniwetetatudexifapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=screen+video+recorder+download+apkPDF link annotation
    • 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_off0000b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17A 15244 bytes
SHA-256: 628da1d4c7ecaefe3157da3c6ce2e518a641c1e084f7bdb2f9a6f968635541a7
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 10560 bytes
SHA-256: cc20d606ca4bb789b40014837b08ecabd97e752e1aa2682e081d088f699107d9
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1