Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f9b0a40df93886…

MALICIOUS

PDF

80.5 KB Created: 2021-10-13 17:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 001230c0a001dff449342e454765b2d7 SHA-1: 8165b2785b51e0c8e1c7520b6e89c5215267f984 SHA-256: e9f9b0a40df93886e55e62b2f037293acd92edd1e302505d3dd9a8cb1b9ac9db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=increasing+solubility+in+water PDF link annotation
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/48763241789.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/28472198071.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/ledonadezo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/aeed505c1c2f27fa53de1a91f2ee158c/zoxixanutugisezevosalipum.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/52700148705.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16160442158832---9161695839.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/23334140002.pdfIn PDF document text
    • http://ingore.cn/upload/files/zuwenabanumalati.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xikazugaveradiwisugi.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/xizodakagamonulolesisuvur.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/39171231048.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/vonotapepibago.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109240200265650.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/27759350976.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s9f0qgmjvkm7u1akmiaube29me/vefanadaxemusagarepoduvar.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nebikesirelezenim.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vugudonimilinexefuzujev.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/binabeme.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/mazoniputolejiruke.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/29254422738.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/90977792966.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/17018658877.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ofomeferuxepoxili.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/tadonufutefunovomajuvakiz.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_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 18212 bytes
SHA-256: 0533d8eb52a7b70c5b79ead1c6661043e81594c573c98225c90f1ab600a5255c
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10796 bytes
SHA-256: cdff84f100438ce6b68842eb61b206183af2f109dbd2028fd70e1c71c0d1765d
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1