Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4471b5bf141c58…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ff3a79c040945ef811c37939fee31f5 SHA-1: da792a88578c8a63996613e95d2381f0c61376f7 SHA-256: 8f4471b5bf141c58cec31ad6f0ea88119c31cc9635810c891c197f7f05b4dad1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sujitonweb.com/userfiles/files/goguzoxogodaponefuzox.pdf In PDF document text
    • http://centrons.com/uploaded/file/683149268613cfb85c3ebe.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77bae3f55---89725270552.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/68094129578.pdfIn PDF document text
    • http://shopabrang.com/images/files/fakirorusutanoxupex.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1249484ea---45512775308.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/zalukabupejer.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109011603528521.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/128411669.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/wokusewor.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/27587871673.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/84892949721.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/jopuniwukibo.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/86822307235.pdfIn PDF document text
    • http://anm-av.de/uploads/files/mipokipa.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/regidikupufugafepoxigawap.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/kutiro.pdfIn PDF document text
    • http://eternaseguros.net/files/files/zoluxekakovezarezebunara.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/xusijusasefakebasof.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/zurafujefokofonoti.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/livegutike.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/43194871435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=n64+paper+mario+romPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 10220 bytes
SHA-256: 9d5f439866414845720f6b23528b2acf834e79c3da8a2909292e8cee42977d82
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 18656 bytes
SHA-256: e651bded7d48fa4b401e247bc31fed054379d754be512594e1400e187dc6556b
font_02_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.