Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0fa048cd4a37c7…

MALICIOUS

PDF

75.4 KB Created: 2021-10-06 03:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a834a6fbfe38624b19728c877e38f1a SHA-1: 0960a623a0ad45016a2c977d3bc694f9dd47f9bd SHA-256: 5a0fa048cd4a37c7cacc2030ca25dc806b8809c278c69d2cb992e8885ddfef04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The file likely aims to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kingalbertltd.com/uploadedfiles/file/88963912729.pdf In PDF document text
    • http://petra-dario.info/upload/datoteke/30503249813.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/abcdb1ce9e6525a4eb644392ebb1324f/30906853543.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/pujidijefakitapavediwa.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/1739954044.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/38461343571.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/85154886132.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/66029761854.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210920125846.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kazivuvulugufujosilesute.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/13524566181.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/84152725602.pdfIn PDF document text
    • http://thongthien.vn/upload/files/13464666838.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615633ee808fb---nivubinofuvamalidadef.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210918_20C040307527E128.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/41671091095.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/56259415835.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40020441481.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/88754035411.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092911053644.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/84688909278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=to+study+various+factors+on+which+the+internal+resistancePDF 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_off0000c12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12C 10904 bytes
SHA-256: c2134dd63293707a524b5e19679ee130c7acbccf7053aca104b3cb14c75197ef
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 17536 bytes
SHA-256: e83f336232e25c8cf31e2c27f04f2e7ca46df10144eb827f9c7873bf058b263f

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