Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8fd115cf6956d1…

MALICIOUS

PDF

155.4 KB Created: 2021-09-12 20:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2134f3a57743c4c38dc03846bb653784 SHA-1: 6fa2cd1cd99ae69fb1cb8ad65c30e614876e9efa SHA-256: fa8fd115cf6956d1a2d7d3532d5eefacfd1dfa0affbbf5e135cd0b4bc75e7e77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, with one such link being http://vagtteam.com/userfiles/Files/vosefawaxalamiwisekof.pdf. This suggests the PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vagtteam.com/userfiles/Files/vosefawaxalamiwisekof.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/tagozizadajetejigovuzuva.pdfIn PDF document text
    • http://sial.pl/galeria/file/95861385059.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/78975247667.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/wowukidiguzurosifixoji.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/mexawotatigo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/96649811672.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tofinewigizuw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6df177f7---nududefunizukile.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/56833587678.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jaxuxumuxodidisiz.pdfIn PDF document text
    • http://kechengchem.com/upload/files/78650921015.pdfIn PDF document text
    • http://signauction.net/userfiles/file/65178177864.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/15068930968.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/lafume.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/32940676342.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vuzugapunajamifes.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/39088668239.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/miniravapi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wirojuvadutazegoje.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/79293638844.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/23b99a383a92c247177183f8b41bcd37/wunilavogegopulawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=marine+biome+animalsPDF 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_off0001fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB73 10304 bytes
SHA-256: 28bbcc27ed755f949539d6ee0563890d4a64067c9bb8cc4696fa880650008387
font_01_sfnt_off00021298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AAA 20236 bytes
SHA-256: dc98652b2780f2fd7d6a058626970f3bd7e12bdf42ee9f96e76077441fda64f5