Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16dea54ef2335a7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 17:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46a7bcb15cb786dd850baa7a81c1c5b2 SHA-1: 4fd6809b47bc389d4a21a28ead9c2b62a7d6850a SHA-256: d16dea54ef2335a78cd3ace52b71c2d72a343ebca97ab0dc74db9b30ffa13da0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with high-confidence heuristics indicating it is a link farm on disposable hosting. Several URIs point to suspicious PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pnmanagementsolutions.in/uploads/kufefuker.pdf In PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/23138728638.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tiwusudafamuvono.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/waligilonom.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907070647.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/jexuletenemovulivevoliji.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8565c25---fefitovo.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/30768926121.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/97815525390.pdfIn PDF document text
    • http://soc-in.com/data/media/files/vidaradojagaz.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gikovade.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_114404.pdfPDF link annotation
    • http://tivatijapan.com/uploads/userfiles/file/90913389851.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/75838752742.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/79899520233.pdfIn PDF document text
    • http://furniture83.com/upload/files/70863711454.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/kesawadogepewavu.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/52044261972.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/gefux.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/69549146822.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/xubufuwidaziw.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lotimetawujunugodef.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/84371934377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=indian+movies+watch+online+downloadPDF 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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10636 bytes
SHA-256: da42c94dcf2427c7841b3336b980e1bc897260b50e5191805a78e3dc22890a69
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 18312 bytes
SHA-256: 246975cf704a77145d517d4db2d04cbb7e734d57a5dd255ba93b8d5ff08d52e4