Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0020f3e9574774…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 08:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89cccb8f02216549c762329526f5c680 SHA-1: fd3e08e06c17cb13a012eba94f08fca876bc123c SHA-256: 1e0020f3e9574774d7ae1e3c3015cac35f10660a315d89bbc40384da83553bca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a potential link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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 http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415018b41ac---35319278180.pdf
    • https://eobliecky.sk/userfiles/file/vezitozopitisorel.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/kivolabigiselu.pdf
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/51878570026.pdf
    • http://spain-ex.com/images/blog/file/fuwefajigij.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/78366635015.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe487b779---98972446374.pdf
    • http://www.jindatunnel.com/up_files/file/79885938175.pdf
    • https://peusch.lu/userfiles/files/wofebolifiw.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/52522395780.pdf
    • http://tauroconsulting.pl/userfiles/file/fosisudabemigufitiw.pdf
    • http://nataliashishkina.com/userfiles/file/10142903216.pdf
    • https://big-affaires.com/img/pics/files/83861569959.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/82020143292.pdf
    • https://cultureresortpokhara.com/assets/userfiles/files/36329455672.pdf
    • http://traviet36.com/upload/files/46778380201.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210921053238_1246464159.pdf
    • https://tlproduct.com/userfiles/file/82231913745.pdf
    • http://wagnerpc.com/userfiles/files/24572580730.pdf
    • http://defhjdr.friend-match.com/upload/files/7331590640.pdf
    • http://www.derbysignandgraphics.com/uploads/file/xupiramebej.pdf
    • http://soldearenales.com/galeria/files/zijikof.pdf
    • http://bigdoughpizza.com/uploads/files/lupunabavuroruba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+free+music+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_off0000b1da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 16792 bytes
font_01_sfnt_off0000c9ec.bin
421e45b0c4b6134c928d4cc8810526a71b657587cf63c64604fc654ffba63003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 17356 bytes
font_02_sfnt_off0000f619.bin
bcc6d1098184d3a78d237bec84ad1631555ff570cfdfe1c8b9d80a678b1e3e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10744 bytes

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