Malicious PDF — malware analysis report

Static analysis result for SHA-256 15807edf4622ffec…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 12:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44282bc602414d9e7e9ba5c098b128b9 SHA-1: de401155a99adeb2f8888fb930d1e413a015e5e3 SHA-256: 15807edf4622ffec06c1d48245fac72f8adcfea4d08bdc53c44068ad79b60b4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external links and the overall structure point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=the+croods+2+full+movie+putlocker PDF link annotation
    • http://smolninskayahotel.com/userfiles/file/xajasomak.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/danugiguruminanodazim.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/nafuzuzamalo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/452423246.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109061254195536.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/44855134565.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/vevufefewusuluwajole.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/9911756762.pdfIn PDF document text
    • https://halead.com/uploadfile/1630924365.pdfIn PDF document text
    • https://dacola.com/upload/files/90538244148.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/mamege.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021913711565357.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zonudewikamow.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/35300164957.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/30893549424.pdfIn PDF document text
    • http://dentherapia.hu/files/file/velawefamewu.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/14123782890.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/dalegume.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/50455799074.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/77646698885.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dejozum.pdfIn PDF document text
    • http://rurisnet.org/images/file/65666897879.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/20929978712.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/58150982267.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/10999275964.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 17544 bytes
SHA-256: edcb9e8e1c0237f7b9be2fb510c7805691d7abf2a66e6a179564db94c7f8a487
font_01_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 10960 bytes
SHA-256: 614f022490b67f8383d2eb4ab9a201816705e85bc8861db60bcfce27433845de

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