Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dde71f97ba3e502…

MALICIOUS

PDF

92.5 KB Created: 2021-09-18 10:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38f9d36c2e464e942ed3cccaa8a0ff92 SHA-1: 079d366611cb5e03d89c26283502769e7647bd1f SHA-256: 1dde71f97ba3e502e7cd96777d07264587073f84482cd52afd9bee54341b6362
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/64670322635.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/55190041721.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/61541573463.pdfIn PDF document text
    • http://air-con.ru/upload/files/52699425507.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/58064486086.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/148c14a6f3d51e8006270480e97919a5/94128217546.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/koroziwafoba.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/narigaxawole.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/gekejupimexuwatudopobe.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/12315447994.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/69375877702.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/salajirekaka.pdfIn PDF document text
    • http://kmsenior.org/file/files/jubaletuzusumaga.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/19141500554.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161450805a5aec---vasupubo.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vozapaganolilu.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/18534729737.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/fuwexuxenikasoxamexekuvi.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/fizedisuvu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gabojosekuwuwebulana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=root+toolbox+pro+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_02_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10128 bytes
SHA-256: 1809bfacb2380060412d7c0512c86a894adf5b2945934e8e8eb73f45135c7a16
font_03_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 24780 bytes
SHA-256: f8d0d776e04861a6863ba1c7213a9a32ed0f7522db3abff5df63ae35aaecd67d
font_04_sfnt_off00014be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1