Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b826bc30567d8a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 22:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ffa3d29ca63c98c71d3096d8c80712 SHA-1: 513a144de152937a3a074807c0ccd706e81b3964 SHA-256: 18b826bc30567d8afb3ed0c1b170740459f0930195f27353640806b01211a0d9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are structured as link farms pointing to other PDF files, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of a URL with 'game+booster+4x+download' in the UTM term strongly suggests a lure for users seeking software. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=game+booster+4x+download PDF link annotation
    • http://okun.su/upload/file/fuwobenasatidokawufujoxo.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xarukoporuramijobeber.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/xusovasokidiwum.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kisujopenexanawuxivelifel.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/pudanitodifubufati.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/64172867115.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/25746170659.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/215f13f48a54de9b733802734d9ae27b/nujezugam.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/vupowejafimizikivif.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/vimafifiwakezutifelidujij.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/lukijomobetexubasabozun.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/30839029883.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/guguvujigelewokata.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/guxedanejovimisegemo.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/47037824937.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/87467180063.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vikutilu.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/jaxudipovebugiwepen.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/202219496308.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/6136952975.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/nuzilopirepipapa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5a8223036ef449dda44a7f47ff77627f/dodawozutozerenegipek.pdfIn PDF document text
    • 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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 10760 bytes
SHA-256: 9a506cb424997001213016047d4087e2dd2a2ff52f28cf275f32b145702545ee
font_02_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 17092 bytes
SHA-256: d62b4e741cfc49f833e90a4324d6300b5a22d894bf50a86988ac5adcae7cd778

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