Malicious PDF — malware analysis report

Static analysis result for SHA-256 2019a3442f969db8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 03:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 973e9c8fa88424885062dd96562ee11a SHA-1: a0f2f56f126f5e6802bfd8e3d716d800e407c8e2 SHA-256: 2019a3442f969db891475d428f41fc9cd26f3392b84a2a80cf061a0af24e6c64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest the PDF is likely used to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zusosiw.pdf In PDF document text
    • https://xtrafitcoaching.com/www/images/files/federetemakabe.pdfIn PDF document text
    • https://akvaguru.hu/user/file/talikunubirasix.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/37939760063.pdfIn PDF document text
    • https://harom.ro/files/file/66894980926.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/96684140825.pdfIn PDF document text
    • http://sciattella.net/images/file/mixofapiwuwixufugu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/6453522834.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/17510791140.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/37545925046.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/loworakofupazekuzotape.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94297535533.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6838fc4758534098d0f1406bf6c2e1d2/9225903925.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139278c38d32---kozazavisirotumenegubasa.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/37000580563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=avatar+the+rift+part+3+pdfPDF 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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 10376 bytes
SHA-256: 83ffed6b9f97a3c8ef9badc64f522cc2a3ef2b8a3d08887b4b91706686e2cd51
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 17024 bytes
SHA-256: 958b0945009af26cbb14aa99f276061dd180ca4ef4911f6b42e9853a77fdbeb6

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