Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd666cebc0fbf882…

MALICIOUS

PDF

70.3 KB Created: 2021-03-18 04:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c29f90fa3adac89da29e271680b288d SHA-1: d41088373fee8e8dabf2d4d9be68bc2456b14aa1 SHA-256: dd666cebc0fbf882c7c0e9c11e1f2c165ede3187e05c77d23bfc551961740ebd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to mimic search engine results for educational materials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document is part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=cambridge+primary+mathematics+skills+builder+1+pdf
    • http://lnstagramsecurity.net/85172080615eekn6.pdf
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/9341453.pdf
    • http://gomivewikikuwu.22web.org/dituwi.pdf
    • http://dk-inc.xyz/3757527462r0sd1.pdf
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/popifev.pdf
    • http://ziwotixog.22web.org/adobe_reader_software_free_download_for_windows_xp.pdf
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/3920120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://talanusedos.epizy.com/amigdalitis_bacteriana_adultos.pdf
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_2b01e3eebb8d450c8ae572910d97666b.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_2cbb7cfd1e8b4cd4a31e9a1366aefb99.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_6d357c442bcc4ddcaa9b0b904a301b29.pdf?index=true
    • https://s3.amazonaws.com/fogibi/indonesia_airasia_flight_8501_report.pdf
    • https://s3.amazonaws.com/gomakobez/numl_admission_form_fall_2018.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_daee0a599d5a4ecd9cc3f9187b462555.pdf?index=true
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_2c4dced223f94497b7cc9b3a2cade4a2.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_f874d67e092a4d16beb71b6218e5645b.pdf?index=true
    • https://s3.amazonaws.com/sugosubexez/nones.pdf
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_8852391c467142f8abaca0dfa0ee7c4c.pdf?index=true
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_5e2997fddb7e43b99a00e758db0f87c2.pdf?index=true
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_61a4d4bd7b0e4ec4b22a0f83fc9cb671.pdf?index=true
    • https://s3.amazonaws.com/faxaxos/winigoralulunuje.pdf
    • https://s3.amazonaws.com/zazelujeju/57443872918.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_off0000d2c0.bin
5df87b577e85edf095c6eb741b5e6eca86521abd39e5529f3d2f4380f8c2bfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 5832 bytes
font_01_sfnt_off0000e677.bin
b8d113d6c5d32b0a6bdd01a98e6f845dd214190aecae4c86d9efabe213704462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 10972 bytes

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