Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd74889fed4502…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 13:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f299f2c0b0dd7d53670791708c10212f SHA-1: e7d73d325babcda2aca334993cffe59859629697 SHA-256: 20cd74889fed4502d32e2be8b2fa52de538fbf08c7b7a28dd1f9528464216c83
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are algorithmically generated and hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://eros-arena.com/eros/userfiles/file/fogubeled.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/jomiduzaxuvuradudil.pdf
    • http://mega-treid.com/userfiles/files/24517001858.pdf
    • http://cableesmaltado.com/d/files/34246339356.pdf
    • http://mega-treid.com/userfiles/files/23088936388.pdf
    • http://stjconsulting.it/userfiles/files/gelotivet.pdf
    • http://bonezi.morefriendship.com/upload/files/68122589828.pdf
    • https://lacgl.org/upload/editor/file/lawaginadipereno.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/98312500813.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5ef1bdbcafc79b8d244fab47b22489eb/nedosurelokifilebasisuge.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zupatazikovofuzaz.pdf
    • https://invest.pl/userfiles/file/23504096161.pdf
    • https://investir-petroleo.pt/ckfinder/userfiles/files/bikuwapura.pdf
    • http://autosoftware.company/autoresponders_images/files/60511202046.pdf
    • http://cheumst.com/upload/fckeditor/file/43250832681.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/33435113922.pdf
    • https://snqrsl.quebec/upload/editor/file/45236985386.pdf
    • http://3qbuy.com/CKEdit/upload/files/24385984876.pdf
    • http://ergakiland.ru/files/files/felobenumulaxaga.pdf
    • http://wdnederland.nl/file/40559693275.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/td2f80d44tim4762en0ukk7kbi/zizeputasi.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/4635963354.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nolusosexur.pdf
    • https://108pizza.pl/uploads/userfiles/files/pokamaleruwifonolu.pdf
    • https://sskundal.com/userfiles/file/31622664339.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kamihime+project+r+android
    • 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_off0000b2dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 16792 bytes
font_01_sfnt_off0000caf4.bin
ea14f65655d097d365592b376b623b73037b80febaa88a53456f0f5ce8f6053d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 10688 bytes
font_02_sfnt_off0000e32d.bin
8cb378383e8e94790f063059938bb2d6b86f79a3d420d90433604f9a1cd0c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 15140 bytes

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