Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d6a1ed1dba9783…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 07:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05a6ae162eff3936ef08458cdfd84216 SHA-1: bfeb7b9d4cdb9ad19d57ac34613e84ad1517876b SHA-256: e2d6a1ed1dba9783d6d3b7b76c02823d94544e32f0bc9cdfc908e68e0ac220cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous external URIs, including one pointing to a suspicious domain, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sccsfz.org/upload/2021-09/dawunuxafurawibu.pdf
    • http://kossuthdigisuli.hu/userfiles/file/dekone.pdf
    • http://3mfa.com/images/editor/files/5101604409.pdf
    • https://ijfbacknumber.com/editor_up/30873172416.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/zikuvusigo.pdf
    • http://marcobernini.it/userfiles/files/76262333097.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613432f446156---22298316461.pdf
    • https://allianztc.ro/files/file/mivukapifemagu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/eda8c452c10a9d584cf28f4eb5a07332/67235728878.pdf
    • http://abovomedia.hu/_user/file/jabuboworakifewibitej.pdf
    • http://sportschoolindex.nl/images/uploads/87831302779.pdf
    • http://conhantaoankhanh.com/webroot/img/files/94864433577.pdf
    • http://w3-japan.com/js/upload/files/64708034999.pdf
    • https://bcm.es/files/galeria/files/lamanevarakilopes.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/vajemiduwobo.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/kirafozotaxunesegi.pdf
    • https://giriconsultancy.com/content_files/files/29430072590.pdf
    • https://justbuymeds.net/userfiles/file/93696269205.pdf
    • http://kiiga.ru/userfiles/file/jenogunot.pdf
    • http://amkchem.com/upload/files/jusexumubofububek.pdf
    • http://qunjl.com/userfiles/files/21775821186.pdf
    • https://guclupin.com/calisma2/files/uploads/34227963661.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=unifi+vpn+android
    • 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_off0000bfd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16792 bytes
font_01_sfnt_off0000d7ea.bin
bbddba4d6a2f4f4320acd3ad0db2f2bf3534064c9ba9388e2a804d9c78840945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 10120 bytes
font_02_sfnt_off0000ee89.bin
4706d7babcafcfb6006e9bcb43e05042aac80ad76e5d6c9279ab0d24adf0db4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 18328 bytes

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