Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f6aadd07aeac1a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 21:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e07018c44fa7dea6bb3eb99e073f70d SHA-1: eb6d5b3fa4a9041974e6252be1f3cd8acd5b006e SHA-256: 01f6aadd07aeac1a9cdf1bef34de14e010ad33ebae0d2a7c6543a191bc733856
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the PDF is designed to redirect users to multiple external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://chcial.ru/uplcv?utm_term=modded+pe+apk
    • http://nusratali.com/userfiles/files/82051698294.pdf
    • http://arhive.np-sp.ru/img/file/83620228043.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/97631758661.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d904930bc722fb8be02934c53905f06e/29414603871.pdf
    • http://thangmayedex.com/webroot/img/files/kixozajij.pdf
    • http://flirdining.com/uploads/files/tonisubexibojurupul.pdf
    • http://studiotecnicodavico.eu/userfiles/files/97249832947.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1631090707.pdf
    • https://dom4m.com/userfiles/files/78066410653.pdf
    • http://agrihitech.net/media/ftp/file/76955024363.pdf
    • http://vaonhaphatphap.com/images/uploads/files/2745505775.pdf
    • https://ph2020.org/ckfinder/userfiles/files/jipenu.pdf
    • https://viessmannboilers.ca/fck_upload/file/10564314505.pdf
    • http://red-persimmons.com/upfiles/editor/files/ludazisalakavonisijugu.pdf
    • http://potlista.com/file/files/13325787275.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/nedikolofonazipo.pdf
    • https://worldpigment.com/image/upload/File/61521849651.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tewesobasij.pdf
    • https://beyondpins.com/calisma2/files/uploads/67040009580.pdf
    • https://506hlapeta.com/files/file/48158138610.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901183245661353.pdf
    • http://ooexperience.be/assets/Image/files/fixeboxisusexoritute.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/82239921510.pdf
    • https://oddluzanie.net/userfiles/file/kedexediwetukumepebugebek.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e8c5e2a---47931074584.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/37379643480.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f8.bin
2c466c1328eee05c28c862b01209a02e600f2fb0ef6904bf2b8be7fe16353e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 16092 bytes
font_01_sfnt_off0000ec1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16792 bytes
font_02_sfnt_off00010430.bin
63567f8c67ae7fb40f685154b147ae837f16f41116d0e7daebae0a5fbfcb6975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 9860 bytes

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