Malicious PDF — malware analysis report

Static analysis result for SHA-256 18abb50d213b55db…

MALICIOUS

PDF

74.6 KB Created: 2021-09-27 01:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dcdfffa24a5a064741e72b574758b39c SHA-1: 1165fc47b4f9e61b47af1222068765b1a52a96ea SHA-256: 18abb50d213b55dbfc331afc1da70991a51e81753e88735c62477bbe0ed11586
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malicious content or conducting phishing. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to harmful sites, likely as part of a broader phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://crewmak.ru/uplcv?utm_term=internet+speed+booster+for+android PDF link annotation
    • http://happyhanool.com/ckupload/files/11736701927.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://betenrealestate.com/sites/default/files/file/nolotu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/63049761483.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
    • http://tipiland.net/upload/file/xifagezufafegisaziga.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nexod.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/97547721396.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/88778406547.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/wubibelila.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/21504346510.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/866570f3a92dbe15cbc328814c4a20e3/43104321561.pdfIn PDF document text
    • https://viceda.com/userfiles/file/92615819495.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/kevobuw.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/63165262382.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/makemuxaritotuguroxejik.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/97175454405.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/39135410388.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404739414d1---10987578294.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/16697342859.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/32674912787.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_9A8467195072E469.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/57954347304.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/10468686588.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/jolazaroxuxenid.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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 18672 bytes
SHA-256: de4386e05a1f5600fcdc09bfd165a1b6dcbe2e810d98e6b54935d4a6de8f64cb
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10536 bytes
SHA-256: b6399d969b97a83dd5989237f4f6574b8cb89a04ed99af92f955d55e83a9c832