Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cc0fd9ad46d1c5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 01:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f810fd0c89481e18003074b639e585b5 SHA-1: b2cda7216f1faf2baf8ce0b0d2e2b1bbd6d59fb4 SHA-256: a1cc0fd9ad46d1c58f3385db2c2264753e20836b32e92146b9d9cea825f74669
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely serves to obfuscate the redirection or initiate further malicious actions upon visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+do+i+capture+a+screenshot+on+my+android
    • https://eltdb.com/UserFiles/files/nasofumutave.pdf
    • http://immobiliareborghi.com/userfiles/files/rigenesedupe.pdf
    • https://alice-immo.com/userfiles/file/19179533260.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310553cb30e---70638853803.pdf
    • https://imihwa.com/uploads/image/20210919/files/20210919064637.pdf
    • http://imhome-listings.com/userfiles/files/golafefad.pdf
    • http://wecans.net/_UploadFile/Images/file/pulilab.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/dajikitenet.pdf
    • http://kemenyseprosiklos.hu/upload/file/xaxixo.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/11790393570.pdf
    • http://frutapac.es/ckfinder/userfiles/files/nimijigob.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/xadepaxiz.pdf
    • http://ekopaczka.pl/imgbrama/files/vivokelufax.pdf
    • https://a-guskov.ru/uploads/files/rufupufulatekudij.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/zusutitamijif.pdf
    • https://pharma-tools.eu/galeria/file/lerepino.pdf
    • https://observatoire-omic.org/documents/file/lejebopa.pdf
    • http://le-bouquet.be/userfiles/files/zubodumetirisirudafef.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/47161874102.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/kalutidakirixiwida.pdf
    • http://gbfrjournal.org/pds/userfiles/files/97479055655.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_off0000e111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
font_01_sfnt_off0000f928.bin
8ce213991e621aa47f97177fc55868b27ae80c038749603c78f96e44ee936dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 11024 bytes
font_02_sfnt_off000112a7.bin
d09b96eab311f009a776bbf294b1dfa7da43ca09e482931a3c64b141ed2f0f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 18396 bytes

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