Malicious PDF — malware analysis report

Static analysis result for SHA-256 2490794d826d75a9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 13:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aa4c4d08aa00f917aadf31fab792b20 SHA-1: df6027e5e0ebcf807abcbf4996075574385111c7 SHA-256: 2490794d826d75a990db2b4897852d9244a9ee18904e8f53d2bb6d88f4fe06db
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://enovosti.info/ckfinder/userfiles/files/xuxilojulif.pdf In PDF document text
    • http://houselandia.ru/files/jasezema.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/pajitavegupidomasegeb.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/42486005181.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/5500412805.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1835792333.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/7027688043.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wolokerabomodomupuf.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/73580973530.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/tuvevapa.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903144640.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210907_300129976B851B54.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76219883468.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/13fe5d63e0fbaf19c56080c6cda6b1ef.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/91463524348.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jomexuburuduk.pdfIn PDF document text
    • http://nemochem.cn/upload/files/saterezatatotojugonuzufor.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/39870173872.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16016176666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cloze+procedure+worksheets+first+gradePDF 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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 18280 bytes
SHA-256: f4bdeefd7f73ce36f19ddb12f5633ae399dab2a783efdd13e4fc7c04857ffe3a
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 11164 bytes
SHA-256: 0b842d3f0265b1ae686e2e49d418b15ee7ed88158075f59a83388bc1afaad4d9

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