Malicious PDF — malware analysis report

Static analysis result for SHA-256 33540ee9f34f0ca6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 04:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fb144a1b4f3fee808506e3aab044962 SHA-1: 2a167568b1435c3a73625e7a757b71742e412e7a SHA-256: 33540ee9f34f0ca6ed56ab933e751ce9b1fee39ddc8b521165868b2abf5c230c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, with numerous external URIs pointing to potentially disposable hosting. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smwebtechnology.com/arishayurveda.com/userfiles/file/26469306180.pdf
    • https://eccdc.org/application/webroot/userfiles/file/gixobudetivuwik.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/1743307856.pdf
    • http://vietsinphar.com/uploads/files/vubegogijigo.pdf
    • http://babyindex.nl/images/uploads/biwutibotobusunexajesa.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/kusatedebutex.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/xojise.pdf
    • http://mh-gartengestaltung.de/userfiles/file/finotanuladonodo.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/86267529869.pdf
    • http://lynxauto.ru/userfiles/file/didapu.pdf
    • http://hibertek.com/image/files/20210913_060912.pdf
    • https://avflash.nl/upload/files/gutivuvit.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/romosugunuvaparuriwezig.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/71868157478.pdf
    • http://agataklimowska.pl/userfiles/file/4718849210.pdf
    • http://lexxyin.net/files/fckeditor/file/30759708857.pdf
    • http://pololanna.com/user_img/files/sasolejolifebo.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/71761169791.pdf
    • http://savages.lu/imagesRTE/files/94008677095.pdf
    • https://y3stwk65l-mn9.com/contents/files/tajibov.pdf
    • https://zhansq.cn/upload/file/98960350248.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/61003300364.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b47a294d63aaae3feb17d21769bf22d7/8311142979.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/fikinukokatowobawaguziduz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=solving+qe+by+completing+the+square
    • 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_off0000cec2.bin
8a452851681b2e0671d891a3682ea9acaac9e6e33a6f4e30e480180083c9b561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 17924 bytes
font_01_sfnt_off0000fdd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 16792 bytes
font_02_sfnt_off000115e8.bin
9f496a2e294379c1086fe5f0a24a742d1f317d2827a6ae718351badb75e094b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 11464 bytes

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