Malicious PDF — malware analysis report

Static analysis result for SHA-256 3380c01eb5852169…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 22:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52786d1251f8987b997ccaed54a8ab17 SHA-1: 4f05cedf6a31d500077a9f73f4ddb90f3b5aa5bf SHA-256: 3380c01eb585216928ae5faf44a737685e011194860d4f60ee1569eeb0b76c6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true malicious destination by using many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/55214542894.pdf In PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/rixefuporapidexogagonu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xibikigizifegawita.pdfIn PDF document text
    • http://klaaswester.nl/img/file/taxebasujoro.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pugawunedegiloxi.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/89291527565.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/96705977707.pdfIn PDF document text
    • http://irollee.com/userfiles/file/mimajo.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109012237104633.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/24358839312.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/fawubekeferumojuvokifuf.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/17291991368.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8fa19fade396660b23d616b2aca2d035/mokewoweg.pdfIn PDF document text
    • http://nenorm.com/files/files/34506123225.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/zepirowotixaxulelajidufod.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/59044948167.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8799983861378c9210aa9.pdfIn PDF document text
    • http://eva.am/files/3c7ef728cae16b9b.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8dea445e---suzazudar.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/22887220711.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zuwurolipokokikiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+generate+apk+filePDF 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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 16312 bytes
SHA-256: b45cfb7d5c87f522dbc5de92f071e42d86c0986f68200e643913c5cdc07e48bc
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10536 bytes
SHA-256: 98327917667dc516f3ad349994ad74dc7fc4a22ffb4913526f4392a43ca10a50

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