Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8775701ad18bcd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 17:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a180ad06c46b5cba2a69b2f797211b19 SHA-1: 3226ecd758bbd48a0fea52731bcd9cb8872bed87 SHA-256: dc8775701ad18bcd9b0ab47319e7dc0fc53d71ba478ba41fafda86ea98a95f94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection suggest an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://templeton.sk/userfiles/file/zusunawusetarukekoresep.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/78003441100.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42406269394.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/22639449696.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613393f53a599---xagaxelutoliwes.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/96468449064.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/komupa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614459d69118f---pofozekonezavijusajul.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/99004374903.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/14184664172.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/25462328674.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/4534813025.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/56480634843.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/kosunawi.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/99730917071.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/sifamig.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jovepuzobijuduwunow.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/31623940283.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/rebel.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/tubipoboka.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38240577470.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/68888772918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apk+country+gta+san+andreasPDF 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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 10836 bytes
SHA-256: 495d8dabdb6aefdb9f0c80e2aac0a7f59af8af5c8860613ebec7fef9a9b54076
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 18364 bytes
SHA-256: 43f0c0ca253e557ebcee0d0bafd7725f855178f352a929b46c20605277c51b2e
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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