Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fcd8eedbab8456…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 01:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83070e166b5b2a4ffe1f72b2b513f895 SHA-1: eae81ad9739e4c2b26215a3f249dbbbce25c17fe SHA-256: e1fcd8eedbab84568bc311ba141f7c109c880183fc274161a5b24bac77c7390d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=2nd+line+application+download
    • https://euronuts2009.ge/files/files/fosometuduvolanoxixifi.pdf
    • https://x-leather.com/radsportfiles/file/saluzudajigeg.pdf
    • http://bumsnab.ru/uploads/files/19531751391.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/490a1b34468999d96bd50a929719e5b2/gulolubege.pdf
    • https://zegaoyun.com/calisma2/files/uploads/17394406002.pdf
    • http://musiclivemarsala.com/userfiles/files/vekaxe.pdf
    • http://canadanur.com/resimler/files/31525489840.pdf
    • http://librojuridico.com/aym_images/files/didujepe.pdf
    • https://edubox.mn/uploads/users/0/files/58250801684.pdf
    • http://mirsistem.com/depo/sayfaresim/file/4620364175.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137396ac2484---95700654452.pdf
    • https://villanakarin.com/userfiles/files/sekuwalonetalesifutax.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/sugilebawaw.pdf
    • http://newgrids.com/userfiles/file/70314116518.pdf
    • http://pascalparrot.com/uploads/assets/file/58202318329.pdf
    • http://yourmoneyyourbank.com/uploads/File/26695843455.pdf
    • http://hulstcustoms.ru/uploads/files/71503465582.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/rodubaruto.pdf
    • http://nesemlak.com/test/images/uploads/files/bifog.pdf
    • https://woodfur.in/userfiles/file/lumopazobulafirakilakafej.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/putirulalewo.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/fusepamipakogamejawute.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_off0000c732.bin
5e2ca6240abbe070b290a0b61e6c44e77d05d85f8744aa7768ec4a9d8b4cb61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 10348 bytes
font_01_sfnt_off0000dec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 16792 bytes
font_02_sfnt_off0000f6d2.bin
5f38d6d5cd5f04c5106d62324c10b4e8fe0faa84bef62cff3e457112b667a565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 22588 bytes

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