Malicious PDF — malware analysis report

Static analysis result for SHA-256 20707c7dcc304560…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 09:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31504ba947764d0ee54218d8fd7cc71c SHA-1: a7390107a64b046508a09a36f11eb920b652eef5 SHA-256: 20707c7dcc30456079f3d44416add735a2f79e990e4c0e4706d8c6bb2e7193a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may execute malicious code or redirect users to external sites. The PDF also acts as a link farm, with numerous embedded URIs pointing to potentially malicious content, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.salpasafarit.fi/tiedostot/files/1844048973.pdf
    • https://doan295doson.vn/namthuan/images/news/files/lekoviwokigazusuw.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e7345dfnt9dvp14tup8313icmn/62936856561.pdf
    • http://raylutickenterprises.com/userfiles/files/91208369300.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/97854496077.pdf
    • https://hahapediatric.com/uploads/files/202109211422493241.pdf
    • http://cisseo.net/userfiles/files/54484109103.pdf
    • http://www.jindatunnel.com/up_files/file/moruwusisujoxamekodu.pdf
    • http://residencelesaline.it/userfiles/files/46839873381.pdf
    • https://brillimet.com/uploads/files/202109011651451651.pdf
    • http://agataklimowska.pl/userfiles/file/70885659229.pdf
    • http://fratellilongoni.com/userfiles/files/sabasufet.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/givukijesuzavaru.pdf
    • https://suacuacuontoanphat.com/upload/files/38639115854.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/liwelemetuz.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b7b6347fab822f0615d0ad32ee88720c/wigemuxexetopipij.pdf
    • https://lapalettedesarts.fr/gestion/file/jipazojuvarabevam.pdf
    • https://srinivasagroup.com/ci/userfiles/files/24421697970.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rujata.pdf
    • http://hstechno.com/userData/ebizro_board/file/toninobape.pdf
    • https://clubon.top/uploads/files/legupamimudom.pdf
    • http://crystal-lamp.ru/uploads/files/sesogam.pdf
    • http://everbeenmagnet.com/js/upfiles/files/lekapopepedajimubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+book+of+life+streaming+service
    • 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_off0000adc2.bin
c0a4e7b76d9d7378eff4ca647ea5f87377e203d09cdfffd70ae4c804f9b29eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 11044 bytes
font_01_sfnt_off0000c762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
font_02_sfnt_off0000df74.bin
2c0ac62fb5ae5c07c167d6d85f03e8f8d86070b82cf01112f3d9fea7d5c75c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 14736 bytes

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