Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5a3dd06fd8bfd1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c664822800f61c9423f6df940ea0bb2f SHA-1: 0f555af4b889b8e4f4cdb6c8e86874e34520d89c SHA-256: 2f5a3dd06fd8bfd10d74622f5732f2838cd51808357ecadcc132545bc7d2e19d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to redirect users, suggesting a phishing or link-farming scheme. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • 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://ledspectrumthai.com/ckfinder/userfiles/files/xurekuwo.pdf
    • https://nileagriculturalindustries.com/file/44395073912.pdf
    • http://sententtech.com/file_media/file_image/file/20579821764.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e488681b9---98934010498.pdf
    • http://lollanaclinic.com/image/upload/File/59491961714.pdf
    • http://handgun.ee/media/file/21426560527.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/54849748478.pdf
    • http://videlec.be/ressource/file/wapojabevi.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/83671999830.pdf
    • https://szallas-karpatalja.hu/upload/75285385963.pdf
    • http://www.hgbehringer.de/img/files/files/6583120359.pdf
    • https://nanyangtextile.com/userfiles/file/69824577039.pdf
    • http://tysons-cafe.com/uploads/files/gudiwumogireravanegum.pdf
    • http://123podkrovie.sk/editor_uploads/files/66563689014.pdf
    • https://adian.eus/files/galeria/files/32554605320.pdf
    • http://vdi.vn/userfiles/file/23804121855.pdf
    • http://gardens-spa.com/user_pict/file/1338127315.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8a1c01d90a0a22c3a909827358db0bbb/rapowigoviropuwaver.pdf
    • https://sportsslife.net/upload/ckfinder/files/roditosozimoderu.pdf
    • http://dataprint.ie/uploads/file/99831533183.pdf
    • http://wish-pharma.com/upload/files/91120196325.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pubg+lite+download+mod+apk
    • 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_off0000da3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16792 bytes
font_01_sfnt_off0000f254.bin
1f950f1721a6dc671cf2899480a11efa1d5568806966fa4017b668bdf44527f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10888 bytes
font_02_sfnt_off00010b15.bin
1f1848cd18a447aa455d8b2fc3c83f6400dd6e7d70a0ccd5a388c8f815d98242
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 18088 bytes