Malicious PDF — malware analysis report

Static analysis result for SHA-256 649494be6c58ba96…

MALICIOUS

PDF

89.7 KB Created: 2021-09-20 05:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4944c329597e18f6b4b32e5372eb4840 SHA-1: 7e6b388b1bd929628ec74881654b6afd7ec117cb SHA-256: 649494be6c58ba968c20188bbee13abb7a1ecdec65306fed685998955b7073e5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=como+atualiza+o+android
    • http://bachtungcompany.com/upload/files/71754352576.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xafazadu.pdf
    • http://goghepcacloai.com/media/ftp/file/70961306389.pdf
    • http://knauto.com/upload/file///vefapiguju.pdf
    • http://raylutickenterprises.com/userfiles/files/7385168998.pdf
    • http://talesma.com/E/file/10831224915.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39c423966372a063d01a45cf013ef167/11664767564.pdf
    • http://sanchariglobal.com/userfiles/file/jupubosu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3da4d29---gigijazosimibekisoninilaj.pdf
    • http://cbcom.fr/ressource/site-image/files/97277534505.pdf
    • http://greenearthgardens.org/userfiles/8831688922.pdf
    • https://www.confirmedtour.com/files/refijezetot.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/ginikorobunas.pdf
    • http://marta-galan.com/files/varios/file/burubonotinodimuziwipurej.pdf
    • https://iamtimeshare.com/userfiles/file/somaveta.pdf
    • http://paramountswimwear.com/userfiles/files/zulediviwux.pdf
    • http://tgroupsrl.com/userfiles/files/84492997597.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/37967546271.pdf
    • http://novichiha.ru/pic/file/momewavadekurojedeb.pdf
    • https://pesonabali.dswip.com/ci/userfiles/files/raxerujivonuzafirujupuzuv.pdf
    • https://adikkeempat.com/contents/files/muxejejoxusexaminosa.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/74596599837.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_off0000f42f.bin
f547fbe11b1fd5c3ca85096db567224dfb04633277f174e6150f7c19b155ce7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 21620 bytes
font_01_sfnt_off00012a9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
font_02_sfnt_off000142b1.bin
b740d81183caf60e9c63d907db16d36611e7e22f03d4d2f668cd5585c1d50859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 10300 bytes

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