Malicious PDF — malware analysis report

Static analysis result for SHA-256 83be19766132cdaa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 17:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ee88836f443eef89838ca301e80595d SHA-1: 6a21b280695aa17db9d6692fc064e94b2eca684a SHA-256: 83be19766132cdaa97173c1877760887a8f2d7efeea4e308d6a6246b48f3110e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The embedded URLs, despite one being marked benign, point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pfhotel.gr/ckfinder/userfiles/files/23922340999.pdf In PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/binenovinupoxesi.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/vakuxadal.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zudebikitavozolonukusix.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/sejibetesodobijufezile.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2826c0c10fe4fadb95114c52b18057a0/29088273983.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac47f270b9---52385773673.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/68704646392.pdfIn PDF document text
    • https://angkagenap.com/contents/files/wafowap.pdfIn PDF document text
    • https://webmenuplus.com/images/file/vikuxulakado.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/fawolo.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/92504190948.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lapixekulelijuvaworakub.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wilojuribiferatadu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/wibuxizedasaw.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/molevopukofebilufa.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zonejofuziremujimimi.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/9761091539.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/dilodivozimosigus.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/6173536422.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630910811gudiritorufuvadasusiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fifa+14+android+commentary+data+downloadPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/41881495621.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_off0000bb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 10776 bytes
SHA-256: 672ee5ba078bbab086aa07073a96a7e695902567ad4af3dfcd51a817a83b85f3
font_02_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 17008 bytes
SHA-256: dadb75ae5d467e91ec3589f33f01db538569541d09eb55f07593d23f52ef64d3