Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ed443e72652f22…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 08:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fd4792606476bc65088d1705205e1c49 SHA-1: 91f70c5b1c32a9e4e21ed5d213ee2fd00674140d SHA-256: d6ed443e72652f22a87cfd966a6c601634a30ff9fcaeb29126ea88e9e733e331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host numerous links on potentially untrusted domains. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=free+among+us+on+steam PDF link annotation
    • http://hzeiger.com/userfiles/file/kafidalil.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/798cc1604e29a73f4e82512ff2376b6b/nomepatugax.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/ganiz.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901110725.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/nesabuvor.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/35153814209.pdfIn PDF document text
    • http://446888.top/userfiles/file/24423528555.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gemodenuseladowobogibite.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/19789397828.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/daxeloregakojunoxifif.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-14-14-55-79.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/petizobo.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/labem.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/dulikuvipadesijowoxonif.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96538552733.pdfIn PDF document text
    • http://tochuchoinghi.org/files/polekibuwomaxedimu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/51739319997.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/gokipixe.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kupututipibeweda.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/68194868385.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/41410234596.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xobelunupekunaxor.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335f93e7a16---48170885100.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/revidog.pdfIn PDF document text
    • 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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10388 bytes
SHA-256: fcc43f00eb6b6e97ce7f2ca2da8138d1407431d9bbc50dd126d3c619b1f6d1f0
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 17260 bytes
SHA-256: 7eb910f65bfbcbc3025835f31f8b1ad894d162f8a53430bd4d82676cd0a22b6e