Malicious PDF — malware analysis report

Static analysis result for SHA-256 123749d0677ab7a9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 12:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05c5b9fc2b107ca958e6db0360bce921 SHA-1: e517806ad18527b1c76fe9852ceef65553c7b5e3 SHA-256: 123749d0677ab7a98deb496ed8d401cd90437ebc9b8b36cbd943168e8fff06d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/91271724079.pdf In PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/rofodozad.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/musipofuratozituvufufamo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dipesapodasaguto.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/74134361525.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/44516016924.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/3544066605.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/21467933378.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/xulegijazir.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/87147915882.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/96625272561.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/jonilodomonulodegax.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jokimanuluzikifinokif.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/xuzitisegodegiwog.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/50593900130.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/31706866437.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/79754864848.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zusomapuwas.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f758e36502---nawitemezejovonalabi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/50285022296.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xadozodatodewuz.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109011746483365.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/memisosuko.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/78615937271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=avengers+endgame+m4ufreePDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 21440 bytes
SHA-256: e61f4886075dcc12fd51551c4a4de9c853ece05915d45148ed23dec93d95af2a
font_01_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 10564 bytes
SHA-256: d916a359b6448d9207b62861d96728c657953d341dc64f0b40ac7acd2ce85ad5