Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc360ff2439ac28…

MALICIOUS

PDF

97.8 KB Created: 2021-09-12 14:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7c45e9e55878ff5c4b98b70b5e18fb6 SHA-1: 221282f80537a523cb439a914f6ecbdf7dc29034 SHA-256: 0bc360ff2439ac28a6ad24e1a3271425b14c820698b4caf5586504616c8dac7e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The presence of embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://qiuyutv.com/userfiles/files/20210905122652.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/luririzagu.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/96086037495.pdf
    • https://youkuvpn.com/upload/files/lifodupo.pdf
    • http://chiaranannini.com/userfiles/files/3927486427.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/sugekekedavipumutufo.pdf
    • https://agentcctv.com/userfiles/file/vilogovefijogaxotogibu.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/32339631003.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/23743128498.pdf
    • http://olympicthesportshop.in/uploads/pewaje.pdf
    • http://brukbet.com/user_images/file/kugejovir.pdf
    • http://adasbruiloften.nl/userfiles/file/xuwugasivopedusopofinat.pdf
    • http://mlsy.cz/images/file/files/pojaj.pdf
    • http://nm-union.ru/ckfinder/userfiles/files/59239420404.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40768433b67b4b59af7616c2d4743506/20105855537.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/4218713862.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/sugumuwiberivik.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/63064913722.pdf
    • http://www.cerel.eu/images/wyswig_images/file/tipeko.pdf
    • http://aaas.handyfriendship.com/upload/files/pededamedo.pdf
    • http://luisacortesearchitetto.it/userfiles/files/jepedetewimesosi.pdf
    • https://polenhosting.com/calisma2/files/uploads/53638422576.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/rixetaroxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+plants+vs+zombies+garden+warfare+2+on+pc
    • 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_off00011064.bin
03374485787d51f958ce1e365816210046ce144e496628cb9875a00c9ee077b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 20736 bytes
font_01_sfnt_off0001461e.bin
34ef66430167284570f802fcefa9201964d1ef962c5f618af2416ff5f98b10e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 11424 bytes
font_02_sfnt_off000160c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160C0 16792 bytes

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