Malicious PDF — malware analysis report

Static analysis result for SHA-256 159ea3b4bbc552e8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-15 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: febdf809188955bcd85c0d130bab960b SHA-1: 9d2f61f023583acfa25c436b2694e07bfc6c0aaf SHA-256: 159ea3b4bbc552e8ca46d9c52535cc25324a68ad05fd05f88d7478e004452820
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for distributing malware or phishing pages. The PDF's structure and embedded content suggest it's intended to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pallenberg-busreisen.de/uploads/files/97714240485.pdf In PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/54001997765.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/kupaxerex.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/99865200604.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210904_100008.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jutafakigavatenojisula.pdfIn PDF document text
    • https://izr.fr/files/69114516654.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/muwuzejepevamukogatuxog.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/52065963701.pdfIn PDF document text
    • https://digireg.pl/upload/13791941166.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/11887844779.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/lozazaxo.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/muxefimojovepo.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/64081624903.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd48c40b2a---31609061444.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/wekarof.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/36436065968.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wigonokepariwifoti.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/febofowi.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/80589837804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=e+commerce+business+technology+society+2016+12th+edition+pdfPDF 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_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 15436 bytes
SHA-256: 87015d5e6f5245dc87991a01a764eb281bcab3c57a5f516e3820049517b27103
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 11704 bytes
SHA-256: 47e2d752935638165fc2755a48cefb7ef02711949615c245f6398b3e6d431f17

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