Malicious PDF — malware analysis report

Static analysis result for SHA-256 6063a5c43819b192…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 01:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e79f6e118ddc9febd1dfc2e10827d953 SHA-1: 18cb32b6b1010c22c0a4291b0120b15988bab373 SHA-256: 6063a5c43819b1920ca4dd48270bbeae5d128004cf9c4bcd1ee1f506522eeb73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=henry+clay%27s+american+system
    • http://muaah.ca/userfiles/files/mokowamuvufilenafu.pdf
    • http://xinyuemu.net/assets/202109/files/20210901065124951685.pdf
    • https://przyklejki.pl/userfiles/sazofupe.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/53092577604.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bogojinixuziwaji.pdf
    • http://builderall.info/userfiles/file/61982874852.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c3c5be0ccdb0418686180bf2f1f1a5fd/60706268231.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/komutiwawomigogovotomako.pdf
    • http://alituncer.net/userfiles/file/44622572735.pdf
    • https://ehlibeytalimleri.com/resimler/files/papifiwex.pdf
    • https://vildmarksjagt.dk/userfiles/file/salidegudugaje.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/vagimijifinokivabam.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/nagotekafevisevegabidu.pdf
    • http://pnlestari.com/visitbali/image/files/kidufidu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7932ee825b44388503556d51798ab272/15780724783.pdf
    • http://ansonseatery.com/uploads/files/dusimosobu.pdf
    • http://offerparts.com/upload/files/xemajiwowukowerikag.pdf
    • http://titadoorbinhduong.com/upload/files/38030743404.pdf
    • http://edilcfcostruzioni.com/userfiles/files/tavofisakegexowu.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/45659571.pdf
    • http://lor-rostov.su/userfiles/files/54723513361.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vopexunezax.pdf
    • http://80tner.netsociality.com/upload/files/14048633798.pdf
    • http://metallpress.ru/files/21161383879.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_off0000b165.bin
3ddd5971c0f2622e6da6e9a3f80e221741bdbcbe990304337939e41488c5e53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 10408 bytes
font_01_sfnt_off0000c8f2.bin
e797409261d9536c1eb1888dc7207e756653a1e882365cc487d0d735bb012efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 17816 bytes
font_02_sfnt_off0000f5f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes

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