Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c581feb19ec31…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 02:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3e03863d544cb5de6b3c85f060f5373 SHA-1: 7c258fc1d98da385d1e2e63c77371f0cd411d24f SHA-256: 6d3c581feb19ec315400c32486ee2ad3b68996466ab14fbb178dd2b92b82b1ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://apsons.eu/files/file/21067682872.pdf In PDF document text
    • https://panelshock.com/userfiles/file/gurafowazarukofosukova.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/92904886401.pdfIn PDF document text
    • https://gdaniec.com/upload/files/zalokuruk.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/68180680539.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138135460882---27429471229.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/14598852556.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/malodetumotaf.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/viwunifumo.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/jujaxe.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/zaluxofofeteteritizegedu.pdfIn PDF document text
    • http://puisan.ru/uploads/file/xenoxamafagubu.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/teferisusakijomerawepiki.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5751e036af0fbb6af7cb05d32ed941a6/98443162682.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_2F24BEB38E85DA2E.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/16684059909.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xupividar.pdfIn PDF document text
    • https://rintrans.com/files/vubedirelalezefefo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/85147939940.pdfIn PDF document text
    • http://chayka-svg.ru/files/92573963466.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/62249839243.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/66560020218.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/61608195377.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/jorusimezodizutegukagul.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/pibijiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+online+money+glitch+2020+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 18588 bytes
SHA-256: aa10041f3c1ba09917db4ed6e30c22866951ef76097df0bd613f43ebedd83971
font_01_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 11196 bytes
SHA-256: 0152bea6c4c7579b7fbdad9ef7fedd2880f38aca4003a738adfb922089f0dfeb
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1