Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c600150adafcaf8…

MALICIOUS

PDF

63.8 KB Created: 2021-09-21 07:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c41fbe514a251cc36e69f359280db29b SHA-1: f255be8a29e1a2aef70ef01e8dea1576429d933f SHA-256: 3c600150adafcaf877dc7a0ddaedc1d87be6625aebb90440e48a8a06bac42315
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or redirection attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 5

  • 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
  • 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://sabagdasarov.ru/upload/file/zadimekeleper.pdf
    • http://snsi.jp/image/news_file/gogaroso.pdf
    • http://feldbach-tourismus.at/files/96842717815.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/bogidupe.pdf
    • https://investir-petroleo.pt/ckfinder/userfiles/files/sakevataji.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-19/20210919055918907185.pdf
    • http://vnationwide.com/userfiles/files/fesezexofosa.pdf
    • https://magyar-logyogyasz.hu/fileok/file/siwegowatibisuso.pdf
    • http://vangphutai.com/images/uploads/files/dudupiwefirixo.pdf
    • http://firewheels.pe/userfiles/file/83603317935.pdf
    • http://stelmart.ru/userfiles/file/kinadadewatosolujavudeki.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/jesupozatufumaxezew.pdf
    • http://nomorecpapmachine.com/userfiles/files/18746330002.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/35809984397.pdf
    • http://leguido.net/files/xudugenawo.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/46808845012.pdf
    • http://massimosusto.eu/userfiles/files/mituzedusuromolewobu.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de24457754---difazitilivibopozozesorun.pdf
    • http://tano-cable.com/d/files/tepevakimogu.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/31082367956.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6fdec1aaa20384b2a101908ff7eb5149/mesuzajejujebefekijoxoxi.pdf
    • https://undergroundtakeout.com/userfiles/file/fisuxidur.pdf
    • http://harlit.com/upfiles/file/38890614810
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wireless+connect+android+to+tv
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 16792 bytes