Malicious PDF — malware analysis report

Static analysis result for SHA-256 935641b8c5173c54…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 23:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 448cdb9013d320a0d95dd339d9d0e1a0 SHA-1: e7780bedddab6d8b0865b8548a3bd642fb3b3e90 SHA-256: 935641b8c5173c543a6ce97229b471c3c3a9e84ab6fc937fbe76fc1e23ffdda0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=bangalore+master+plan+2020+pdf
    • https://cdn.sqhk.co/jarixizotib/jifhjf1/25839741392.pdf
    • https://levavago.weebly.com/uploads/1/3/5/3/135343263/815f5.pdf
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/tunupelogu.pdf
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/9894387.pdf
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/wazanapib.pdf
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/labenebapu.pdf
    • https://cdn.sqhk.co/wozovege/vjigha0/mafia_vintage_car_driver.pdf
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/2616621.pdf
    • https://sokepubin.weebly.com/uploads/1/3/5/3/135391759/03105a8b.pdf
    • https://cdn.sqhk.co/bikegola/j4ocit2/xiwapobigixuzumiralixo.pdf
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/tarivaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abe70d2e-68f8-48fc-8735-d7cc7cefadf4/14683804591.pdf
    • https://uploads.strikinglycdn.com/files/17c3a041-cc00-488c-b637-ac6b2de14cd7/83352104656.pdf
    • https://uploads.strikinglycdn.com/files/b10ab802-6952-43af-b677-f9cdd73c6622/sofefa.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_43970a277995491f89a918e88f60ba8c.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_3167453413d6409a8ffccf5c14b29015.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67c5dc8b-7788-4f5a-a9f8-09b458756482/who_dies_in_ff7.pdf
    • https://uploads.strikinglycdn.com/files/9906674f-f0ca-4b7b-a3df-1ef534d8a447/free_blues_guitar_lessons_for_beginners.pdf
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_97baca5a20b547c5a1024ecdd8ab916e.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_0bedcc3d4cbf4b4984cf44ba69d1f5a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9dfe9aa-c0ad-4f12-87ac-c5689c7f1983/pawimolubopu.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf2.bin
cb36516e2ec741e6fe9ae73ed5b71a0002d233608c2a2ef22e0a727fec676359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 5684 bytes
font_01_sfnt_off00011136.bin
5d624fbdf5cd4559ca27bdba0cfe5dba50a89c7b1d5551dbec5e43e6dca6f968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 12824 bytes

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