Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa223e915e1b9f8a…

MALICIOUS

PDF

75.2 KB Created: 2021-10-12 20:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de3a4de9019a51f7c264ecb38355ea61 SHA-1: bd3ba7b8d333ebe8ad4c102af2384572059db459 SHA-256: fa223e915e1b9f8a92c8c6d6bdde505ab377680a8c6f380e45131b7f8c3a8fa8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or phishing for credentials. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://usaoxin.com/userfiles/2021-10/file/33703026728.pdf In PDF document text
    • http://likebarcode.com/image/files/20210910_110749.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149156416240---88163328900.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/rikodowikapilasezo.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/29070723292.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/23033817303.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1616311bce3f90---kiruk.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/pojujeditadezubefipixi.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/20374665151.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3fbafe45---24860788363.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/mokavekude.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/63861636165.pdfIn PDF document text
    • https://sscs-uae.com/userfiles/files/sifelowumugirovafalumilib.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/noripewuzusiviruwawebes.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/83431596679.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/15263055483.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/raduvomubugakotovovok.pdfIn PDF document text
    • https://proxus.nl/file/kofubodojoremorapa.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/ragaz.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/76539742989.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zegivubexov.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zujozizifig.pdfIn PDF document text
    • https://umutfm.com/resimler/files/jewiligekogedevewojawesex.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/85168801822.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=que+chevere+3+workbook+answersPDF 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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 18452 bytes
SHA-256: b735cbaeb76b551bb2fb41e78f58d9144faecd1c5560467253ed6efdf7991a40
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10804 bytes
SHA-256: 4ca59731475db5f0c04c3e94eadd6fd7e927f81444e876c9a575fe70fbe8983e
font_02_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1