Malicious PDF — malware analysis report

Static analysis result for SHA-256 989e2ac2ed94757a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 15:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67e944d4c247fc00ba168a948e0d3bf9 SHA-1: 342618cbde9097f0219c5cb4aba6adcccf8d1f17 SHA-256: 989e2ac2ed94757a7858819c3a472709b1aaa95879b723caf20d0ffcbbaa2c26
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://klick-tipp.at/ckfinder/userfiles/publics/files/bumezuliwagikubulibiwi.pdf In PDF document text
    • http://mijn-nederland.nl/userfiles/file/wigijamatakipojorigi.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/peputabuzexulobimidifiz.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/60671457373.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/unmq7fpomm08728d36975hrnhg/jivegudu.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jibajivivapolofa.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/92062555498.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe68d72e7---gexoluxapedopuba.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109060712134649.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/60901484374.pdfIn PDF document text
    • https://advik.net/userfiles/file/sunimobumamuxobo.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/dudaluwozeregefo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/32400185534.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/88750766756.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tojevabufurekam.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/2116714452.pdfIn PDF document text
    • http://change4best.ru/upload/file/99050737140.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121632162884.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/momilozo.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33198288519.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/zivaxizar.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/82403891806.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/34254573592.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/gisosulimebore.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202194232995516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nba+hack+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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 9820 bytes
SHA-256: 338a045011251bc1fd8a540e9b57cc894cb90964e790d1925c9457fdb62bf896
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 17004 bytes
SHA-256: fb0ed94d0851a02a42f2a40da0d30864a93a1797669b02a93a6fde03c577b8a7
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1