Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aa9cfe1afa5b00…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 05:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ecb5d530debf1a55645398fada50360 SHA-1: 135c18b8b3919497c1856adc84216a31dc03acb1 SHA-256: e0aa9cfe1afa5b002f6374246e75ec22ac3da7f17e74a6b10caf24729be747b4
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to other PDF files on different domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting a malicious intent to distribute links or redirect users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=mankiw+principles+of+economics+solutions+pdf
    • https://mavachhaiphong.com/upload/files/sofogamazitemimomokezaz.pdf
    • http://reelproductionshd.com/userfiles/file/40263782460.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/40438349009.pdf
    • https://alarouba.com/ckfinder/userfiles/files/muwiwujipomuravexupalonud.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/35945701573.pdf
    • http://on-video.com/movies/movie_data/file/28485954391.pdf
    • http://congtyvima.com/images/Download/tonuxodurebafelugobuki.pdf
    • http://villalapinetafavignana.it/userfiles/files/ripaxabajolutedijuboz.pdf
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nanifexobemowupu.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/64042430981.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/75b31901ef0d610416be698897033139/xusonasarilanuwalakapob.pdf
    • http://ugyvednok.hu/userfiles/file/papezi.pdf
    • http://kaupa.cz/userfiles/file/14600798351.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137051ea0eda---mobakorasabazekiwade.pdf
    • http://shanghaiqingchen.com/upload/files/pipaxekubimat.pdf
    • http://sinching.com/uploadpic/files/202109120054375029.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/58667632297.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/79231085317.pdf
    • http://edv-denk.com/userfiles/file/54906508775.pdf
    • https://mchs.kz/userfiles/File/moxajavadinewekovadiki.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/dajim.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/92344361212.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_off0000d5f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16792 bytes
font_01_sfnt_off0000ee0f.bin
794a1185485b062a9924bb1210b9cd8c0e96c96a32c322be074716d96f1a51ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 11052 bytes
font_02_sfnt_off000107dd.bin
c2ea98d7604edc70f840c091e6c2e0f8bd590bb976f594c988e56fc4101acfeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16648 bytes

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