Malicious PDF — malware analysis report

Static analysis result for SHA-256 202c53597e8e392a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 06:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885a5f04fca64f1773c92fe88a2f92d5 SHA-1: e8967041f4d55753efd904f00c6b056b31ae9926 SHA-256: 202c53597e8e392a9a60c964b5169dc900967b3eda93be7e904de0fdb7b09b7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tekmaker.com/upload/files/dezinarovileramovamodarop.pdf
    • http://koreaticketland.com/userfile/file/zimeku.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/32313946311.pdf
    • http://botosani.ro/img/uploads/file/gesikaziwifabupiguvowelag.pdf
    • https://kstraders.com/userfiles/file/kewajujezo.pdf
    • http://galettedesrois.eu/userfiles/file/73498405055.pdf
    • http://www.santamyoga.be/images/file/29348218465.pdf
    • http://basaritarim.net/admin/editor_resim/file/zalidubax.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/62667578956.pdf
    • http://kfoodntea.com/dataroom/file/71246442316.pdf
    • https://tjpapigroup3.com/contents/files/kuwiloponorobofigabuke.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/tawoxokudavisulamopubigug.pdf
    • https://webornate.com/viking1/uploads/files/63187175786.pdf
    • https://plewmal-d.com/Uploads/files/tunuladalonomimopalogute.pdf
    • http://transporteslaplata.com/imagenes_web/file/rezibudofawatosed.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/papana.pdf
    • http://zsmnowakowski.pl/userfiles/file/gulokonisu.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/kuzide.pdf
    • https://konzolstudio.ro/uploaded_files/file/26363747705.pdf
    • http://edukoc.net/userData/ebizro_board/file/94716594499.pdf
    • http://firsttimehomebuyerstudy.com/images/file/44040330815.pdf
    • http://thoitranglani.com/upload/files/23794701106.pdf
    • http://solarissoft.com/img/userfiles/files/kanisatanexobulesofukevof.pdf
    • http://nikolalepojevic5.com/multimedia/file/tagebe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=common+y+words
    • 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_off0000b27e.bin
beb2e3ea75c52be6d7f7e2c46f2253b252ad93e89267eb47db674a2b0a10bcf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 15220 bytes
font_01_sfnt_off0000d8e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 16792 bytes
font_02_sfnt_off0000f100.bin
fb779e0d80a4ff018a7f5caf9575a4d2a16e9e6a8a072064607e47407286fb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10108 bytes

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