Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a74545211f532e6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 11:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c58a0800e6306ded5ed69fda08b4471 SHA-1: 35878656a91d01445abebff44158c7b11454fd03 SHA-256: 6a74545211f532e698b84212662b723948e7b8bb39969bab3f199b2fd5516ad0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs and the overall detection suggest the PDF is intended to redirect users to potentially harmful websites, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://seto.cz/uploads/xirat.pdf
    • https://tskrea.com/userfiles/file/89229356963.pdf
    • http://vnationwide.com/userfiles/files/zutenotinewavoropipipi.pdf
    • http://kinel-hunter.ru/upfiles/file/matebalamuzasu.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/2157578647.pdf
    • http://myjobcareer.net/userfiles/file/2021091808132973499.pdf
    • https://icon-studios.com/userfiles/file/90316367942.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/nosaxidibanidonewunuzak.pdf
    • http://violetstudio.in/userfiles/file/75341055880.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/domegetozite.pdf
    • https://kipass.fr/userfiles/file/fopemixuladinojebafadamet.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613028813e48a---40365544432.pdf
    • http://getrade.net/uploadfiles/file/87351656694.pdf
    • http://zavalinka.by/var/upload/file/tufomo.pdf
    • http://modernplating.com/userfiles/file/wopibegodonobekakuka.pdf
    • http://pyhunlian.com/uploadfile/file/piwisabuzuzawafofojib.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f261c2204b---zekajedipo.pdf
    • http://turagent007.ru/userfiles/file/95837186436.pdf
    • https://karapinler.com/calisma2/files/uploads/tuxerubosubidobivu.pdf
    • http://www.mediagrand.hu/data/editorfile/38478164996.pdf
    • http://congtrinhnhaviet.vn/upload/files/vutes.pdf
    • https://ubranni.com/uploader/files/96684016283.pdf
    • http://www.farmaciabergua.com/userfiles/files/noxosirefetaveje.pdf
    • http://norilsk.torbay.ru/images/uploads/file/rupemanaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+flight+games+for+android
    • 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_off0000e9e2.bin
42c0c6f8ec4f5a67fd634db42cd5bc2e35dc2183654a37b29f3f1c171f09b879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16924 bytes
font_01_sfnt_off0001153f.bin
98c89c4ad18e2343a2b1d90f7c36e5f2e21ca2ba6af0322c46c562bd98feb63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 10852 bytes
font_02_sfnt_off00012de9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 16792 bytes

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