Malicious PDF — malware analysis report

Static analysis result for SHA-256 396f8ef18ea79c1f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 15:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 312a90c02ea92bc16bf9cd676edf735c SHA-1: 3f7d2866997bb96113e0cc5c201b4849f91998c5 SHA-256: 396f8ef18ea79c1f2ab5d65f8945e460cd7ed9b923be24b78435d10401295e1b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or credential harvesting attempt. The presence of embedded JavaScript (T1059.007) further supports the malicious nature, likely used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tingchucontrol.com/Uploadfiles/files/48421509212.pdf In PDF document text
    • https://suksesunited.com/contents/files/lunalaji.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/tufewojugataduw.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/xuxonar.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_163123.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/titiwilelufudurega.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c02d124e---zubuxewubexejojide.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zujokakibog.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/kowikemelituguliraput.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/wexiludunakimenogedaduso.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fozuwabanowigojaf.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86051405155.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/xagaralurexujenu.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/togagesaja.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34366753261.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/fetepujinalivusovisulado.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/kobiselolurajuvosos.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jeredulu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/t54jpd8ut73i2tug64fnone8i4/zulasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+fur+coat+short+story+downloadPDF 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 15728 bytes
SHA-256: a9354aed9da5a9713deb29c24123e6c0ece006ad177d40b3f13aa975ccb204ad
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 10744 bytes
SHA-256: 86b6d39ecfea8b65776ebc59f61f3c25dd487923105334065a7e4960180af0f5

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