Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90b871f28b604de…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 18:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5c588bfb341080840a1f6256d72e1eb SHA-1: 3a268c188d8365aa09fa8ab689d968530dc5e926 SHA-256: a90b871f28b604de1f9b1100954a07c97bc5ac62972f9b822904ad336e91f577
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the file as a PDF attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=dictionary+words+beginning+with+i
    • http://dainindo.com/Uploads/userfiles/files/17612586156.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/fanunov.pdf
    • http://falerisztika.hu/tmp/52327667482.pdf
    • http://kliknetezde.cz/admin/obrazky/file/54321604207.pdf
    • http://kaymccarthy.com/immagini/file/bemeke.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/buzotogapusotuzegeje.pdf
    • http://tubietelbar.hu/uploadfile/sasaxijijefan.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b547e6b273---wizezigaruriregik.pdf
    • http://zonazero.es/userfiles/file/xolaxutokewe.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/upljopca1u1ticaa7oae6h35m7/muxutuligalijesej.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210906_B20EB220F62F65F5.pdf
    • https://groupunsur1.com/contents/files/74463504150.pdf
    • http://meubelenindex.nl/images/uploads/zibudusadifofejizirezade.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/47704263500.pdf
    • https://serihosting.com/calisma2/files/uploads/somapasadinuvelujeburidoz.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/pezidisopose.pdf
    • http://avtokapriz42.ru/userfiles/file/wapiposigofokatudixe.pdf
    • http://szpk.hu/_user/file/38890476771.pdf
    • https://anup.bo/images/files/55467113814.pdf
    • https://defrokatilai.lt/images/files/mizuju.pdf
    • https://5udua.com/contents/files/16310656708.pdf
    • http://nelly-design.ru/upload/files/japoliv.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/64346009192.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_off0000d419.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 16792 bytes
font_01_sfnt_off0000ec30.bin
d640a53e6fb73f7f8d6bf0a6c081b240d3a085edb8a666b19ed17b5cd23eb5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 10944 bytes
font_02_sfnt_off0001056e.bin
f950fed96bac3f322839151dca3b246557e62ad4b2c66e65a228807db96a5ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 17912 bytes

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