Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a62f7b98c3f6e31…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66919d185fe6e8a5fb46d0ea385ce24d SHA-1: 809b0bcae9597aedc44bc61b2ba29d23760ad306 SHA-256: 7a62f7b98c3f6e31df7d1ec059021a4896078a5734f06f3bfc16f0ce9b38794c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. The presence of external URIs and a high number of distinct hosts suggests the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mm-podium.ro/userfiles/file/98152247777.pdf
    • http://heyumpnd.com/userfiles/file///60225915070.pdf
    • https://matfplayer.com/calisma2/files/uploads/62715286027.pdf
    • http://seoulsquare.com/userfiles/file/78613810647.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4qm04g2ivgp6c4v69enicgaqi0/welaruna.pdf
    • http://mintaialuminum.com/d/files/naxatikarexa.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/99452436082.pdf
    • http://tongdingjixie.com/d/files/79159244715.pdf
    • https://nergizleryapi.com/image/files/bovenetabidorilurow.pdf
    • http://castrolmintabolt.hu/images/upload/file/75176454788.pdf
    • http://dailythang.com/userfiles/files/88533912150.pdf
    • http://sangjeom.com/userfiles/file///17794579837.pdf
    • http://cameradungphat.com/uploads/files/31895101628.pdf
    • https://ymy-tea.tw/upload/files/pitagorok.pdf
    • http://greensquares.in/userfiles/file///41716610825.pdf
    • http://adhdesign.de/userContent/files/20210910231246-topeluparokoni.pdf
    • http://geasit.it/userfiles/files/19579694442.pdf
    • http://aptekadc.pl/userfiles/userfile/pekekiwujudekesutemekoje.pdf
    • http://dragonera.cn/admin/userfiles/file/52203553779.pdf
    • http://amsasecretariat.fr/userfiles/file/limemaremojuxuver.pdf
    • http://email-database.info/userfiles/file/tejeduven.pdf
    • http://bischofs-scheune.de/userfiles/file/82075828263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=research+methodology+in+linguistics+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_off0000abd9.bin
9f9c33d7faced979d45cf0bd562c6ce3889c00f2185845c47f3887d7e2240cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD9 11324 bytes
font_01_sfnt_off0000c625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16792 bytes
font_02_sfnt_off0000de37.bin
ee2cd1a6c196f7d0cacf02222802c97e2026bf19b656c3b91ca12ed988feb9ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 14568 bytes

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