Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c41659cfef0f48…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 10:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab36621049cc3729b3ae5449dc06c0b7 SHA-1: dc6fe0ddeb4196e583cb9d541596aa58569aca97 SHA-256: d6c41659cfef0f48a618cd07ef735445050a584ccd7f6dbb90619dbbe7299700
126 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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 https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/49740044572.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lno2u53vedr8v8sis3jqmoh0d1/busazivapiluwivenor.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/58858680744.pdfIn PDF document text
    • http://compsult.net/userfiles/file/korogolegavodugoxisonirap.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/21063011588.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161395675bcc21---92073476055.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/20773221488.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/68605187527.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/50111486921.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/lejexotol.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/50149568658.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/50527864815.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/83749556943.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/tixixivofozova.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nofamabuwuzitikinivoge.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff29a19d60---nunusiranosibefavaxeviwow.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wuzeladujapinal.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/31689073634.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0lg9fce7rbvqb7bevq0ngu96l1/40442052018.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/17700639092.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/16003882620.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/nafinomodesavofoteburelo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/leluxow.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/lewixifixes.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/dinimuxajub.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/18915801188.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/53205641132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+ufc+3+androidPDF 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_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000c112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_02_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10428 bytes
SHA-256: 6b7b9d31058ff982cd2f51c08a365db44df4f6fb312ac39aa29e20fa359b3286
font_04_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 21148 bytes
SHA-256: ea2056b4715dbdbf4fcf0ed9a0981ca54c0c05e34b2ecdc1b702a46078b6e239