Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b4d1e49e65fa5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 23:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51fd9b82d7b8fe4207911b5a5546fd96 SHA-1: b6b2dc3c844d1839ebee8063f181161df6f05c64 SHA-256: ec2b4d1e49e65fa5ae53827a7d17c36665a6be11ecbe179a6341166734c0fa9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nusantarabet4d1.com/contents/files/42859870493.pdf In PDF document text
    • https://villanakarin.com/userfiles/files/10065348892.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/virekune.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/75150395457.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/91488563523.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/28918096982.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49850155441.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/sojafega.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4a67da26b15083efb9e6609971d02b22/44172006970.pdfIn PDF document text
    • https://il-gusto.com/images/file/4593044808.pdfIn PDF document text
    • http://gensugroup.com/upload/files/fexezuzofipa.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/85555646965.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/40667858895.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/32984334210.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/14821084493.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/dugimudifut.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/xipogogadowotegeti.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/poreweseperubitolunuze.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tunuxenulujurinepibof.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/98559983468.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/boporewutugofamufupujuj.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/joxopunetufofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+show+cell+phone+on+tvPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10260 bytes
SHA-256: 4d13ab08e3b4a7cabc2da43ced764b47cb7b67b6b52c706945a0a2970c528948
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 17528 bytes
SHA-256: badfc64e3bdf66b9d5a6f24b199a6e5e14b19b6c52b16f5ceeaf98a7e39f4362

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