Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3ab3a2aadc47e9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 16:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c99cd50c07cbe44699c7f17b84f1225 SHA-1: 64165ecf47d09cfa4b1051b2e9f4cf179d99bb1b SHA-256: 3d3ab3a2aadc47e989a989745310764f576ec296fe03e9d7f3155cc6eba40fe3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to potentially compromised or malicious sites, further supports a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5190

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.
  • 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
  • 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://e-ceramika.pl/userfiles/file/22081256601.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/zaxavaritamaruwage.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/11474568410.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/64919000838.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/54791549080.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tegukawa.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/38414057713.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • https://sanagustin.cl/files/mivatiwavekanetevirof.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jakodagefuwok.pdfIn PDF document text
    • https://ibericadearmerias.com/file/75851121636.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/lufubavidofapafodo.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dabexax.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe456bcf3---69516908451.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fosexujereg.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/34842600855.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/toguzuligidozipadigebari.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/norilonapejimalinewesaxav.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2610933993.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/wudawenabipofarelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3+examples+of+operating+systemPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 17292 bytes
SHA-256: d4701dceff7619aa3e5664f48ddcfe82568047cecad00aea4500bb54998759fc
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10992 bytes
SHA-256: c5b27c5b1089f3513900ec86836a494fb9b67402607b0380cbbb2a04fa422f11

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