Malicious PDF — malware analysis report

Static analysis result for SHA-256 21db318677ea3027…

MALICIOUS

PDF

98.1 KB Created: 2021-09-24 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62af287aa25624b6a8124e95ce52221d SHA-1: 62eaa8480a423aa2c256ba7fa516b1ad1ee7032e SHA-256: 21db318677ea30277b0ace9052d0faa836d7fc449d6d48e50489716d16885706
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/80105938848.pdf
    • http://melly-incendie.fr/img_db/44480644402.pdf
    • https://psfund.org/public/uploads/files/cms_files/zomadomidabitibirowiselim.pdf
    • https://haidangpc.com/contents/files/kezorut.pdf
    • http://www.northern-japan.com/image/upload/File/wizoxolizuna.pdf
    • http://innovatepc.com/userfiles/file/7161730628.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/kosapikuwavavidanujuz.pdf
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/rarob.pdf
    • http://101-games.ru/images/uploads/files/84195425944.pdf
    • http://mybed.tw/uploads/files/202109130318276305.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5ec70baef9bff78f7e847e8e111c919c/ralajevo.pdf
    • https://nepalonetours.com/userfiles/files/49288254333.pdf
    • http://jtg-antracyt.pl/files/file/lololozoguliva.pdf
    • http://kayamedbursa.com/userfiles/file/jusukabaxif.pdf
    • http://www.lovebliss.tw/UserFiles/files/bowodapiximadamasuwesefoz.pdf
    • http://pho32shabu.com/uploads/files/wupikal.pdf
    • http://insureavisitor.com/userfiles/file/32265242215.pdf
    • http://jinwoosmc.com/userfiles/file/18559203706.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cdcc02421571126e639991a557751a8b/mizagixos.pdf
    • https://hmradiatoriai.lt/images/files/winatewisofuvagi.pdf
    • http://f-kcc.jp/user_data/userfiles/files/rovekasaziwolam.pdf
    • http://edmo-cars.nl/images/file/3218578037.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=state+the+place+of+metalloids+in+the+periodic+table
    • 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_off0001164f.bin
fc41c3cdce9c206e856e01fac9376e04b24c4d38bc6e605d7a1c0af483451dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 18652 bytes
font_01_sfnt_off0001474a.bin
a44476b86567eb66edcad60fcde8ea93a7c5f1d7b21acedf306241c02442a552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 11100 bytes
font_02_sfnt_off000160ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160BA 16792 bytes

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