Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06803ad2b2c3da9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc3749c6097f2db72332e5dfe07c7c62 SHA-1: 4047ceb2a83cf85d1176eaa46e9ae90e5551f0cf SHA-256: c06803ad2b2c3da9a33547c04a1909f2396425dea924c284cc26330d7e638fbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristic firings indicating it is a phishing trojan. The PDF contains embedded JavaScript, which is commonly used to execute malicious actions such as redirecting users to phishing sites or downloading further payloads. Multiple external URIs were extracted, many of which point to PDF files hosted on unknown domains, suggesting a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sedaciesupravy.sk/media/file/wapesoxidonesiwajit.pdf In PDF document text
    • http://midesignvn.com/uploads/files/nuzaxumumabojofezexa.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_016BDEA936BA52A8.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_CA7658F5FCFD4962.pdfIn PDF document text
    • http://i-physiology.ru/upload/2252465087.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/sezodu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/45975148721.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/pizin.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wiwulexetawebim.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/bilujop.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/45464530927.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/nowuno.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/96205635178.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/20267004834.pdfIn PDF document text
    • https://plasy.com/uploads/file/wasutavimuju.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/40758539981.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/gurikuf.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/fegukiroluguwokigudu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/81233146728.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121632162884.pdfIn PDF document text
    • https://derfo.info/resimler/files/bexalutubumixelitu.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/jawozulet.pdfIn PDF document text
    • http://edituj.cz/res/file/kakivabirekefonaruled.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613952855bc0a---wabugezanuxodewuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+10+ad+blockerPDF 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 17504 bytes
SHA-256: 7ae72e26d977b2a0fc4fd8bacca74c9857d6aa6222d4860ee8159bac7997df8b
font_01_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 10484 bytes
SHA-256: 97ff6a4af92dd392565bc5804f3a1d8d524764dceab00f484cfb9466dc1b1134