Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea68d5f0c41af8b1…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 08:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c716d948df09431b05d5b824fbaa751e SHA-1: 298cc357637fdb092d515caa9a924de485ac3c7b SHA-256: ea68d5f0c41af8b18145af0108addec543f967396d84798292cb0c9de94690a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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=100+real+v+bucks+generator PDF link annotation
    • http://nemdanangpho.com/uploads/2021-09-14/images/files/35712991359.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/xinovaritapokijenumevivu.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/76553938047.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/9835180021.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3898588313.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bd3b392298ac6e6da2bf1c91133dcae1/30847868100.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/16074828826.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210929174422.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/11263480413.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/fuvedegedudefuzozaturite.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/76465319760.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zamudunaxete.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/17855538685.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/solarezaka.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/kamibomomogujefekonik.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tututir.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/11931285333.pdfIn PDF document text
    • http://lgassociates.in/uploads/bilozonudip.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dbe174e08a895ae915a3a06b7b56b4a8/76834061283.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/debuxofuguwipol.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/dujujafud.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/70203824084.pdfIn PDF document text
    • https://salonrewards.ca/images/file/nojolikowexojugeronakil.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_off0000af46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF46 16416 bytes
SHA-256: dd804ac0e7aab6da34719886ff17718dd95a32573c5929edb31fe904196d1ec6
font_01_sfnt_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 10788 bytes
SHA-256: 159df9bb8b89900522aa6c10b394eb0f2de57848a75da55fd3f6cf10dd722470
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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