Malicious PDF — malware analysis report

Static analysis result for SHA-256 257f39a66685b411…

MALICIOUS

PDF

79.0 KB Created: 2021-10-14 16:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9901aa28249e25338219e8aebda6f4b7 SHA-1: 2ce00a7d8d651041b77bae79c149d79c6c430994 SHA-256: 257f39a66685b411ff26916636c45798adf8437cd3c6f447ae836814211adc14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

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://clinicscrm.com/img/files/polalopep.pdf In PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/20141326490.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/molasemawimidifopadape.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/lufajiwegeziki.pdfIn PDF document text
    • http://laduses.nl/image/file/nesoviripawumuwilepi.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/9008005249.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/g1euoprtdkdaj6h8e8a5qtvs3n/kutujivubokuvudatimunaxi.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/11847376525.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gapatozow.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/gofasip.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/84014535813.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/57057281611.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/49861124256.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/17231238310.pdfIn PDF document text
    • http://praguetransfer.com/files/file/43869571385.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/deladefuziv.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/55702991953.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/39719951578.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/81989975826.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/60489100932.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/83308921793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=hawaii+medical+college+costPDF 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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 10584 bytes
SHA-256: 1466abca8874859ab561b9a838f227c8dd625438b2f967a7cc23936595060f91
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 18276 bytes
SHA-256: ced2a3409d361fc974e78b7e209a45561ca13ff7a5bdd38d893878ce948f8152
font_02_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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