Malicious PDF — malware analysis report

Static analysis result for SHA-256 884ea424f525ae93…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 19:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1710c785fdf4f5641405a5a107628c49 SHA-1: 75335b5787368db26f208c59f0f1014d05a1fa7d SHA-256: 884ea424f525ae93a10c18f3855412634b135fa882fca082c4df2cdf5ed3ee3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a link farm detection and a machine learning classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to unknown or suspicious domains, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lure users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/81039294120.pdf In PDF document text
    • http://vongtaygiay.net/media/ftp/file/77322714467.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/bamarapujeramewonu.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/58050809470.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/75928709408.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/67374551452.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zamal.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08be7cfbf987550ce53df8013e74a04f/desarijukazafegeno.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/supojijivubed.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/2244148849.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/89594998284.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/verodazasajadomasod.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/7611891024.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/84840032771.pdfIn PDF document text
    • http://freeski.hu/freeski/file/totolizalapagigawizo.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/33877520914.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/11305578724.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/sugulerik.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/39016276230.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/24679736418.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/39250711626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=smash+flash+onlinePDF 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_off0000ad86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD86 10356 bytes
SHA-256: 210af4a43e3ad743f06d414efa53a0d17bdb07b7d9e0f458c41499a5dd49b845
font_01_sfnt_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 14808 bytes
SHA-256: fab0d22430a3bd3ed49599d77afed55fb90e4c211c1333e0d97d77303bb24050

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