Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eacadb20ff88a8c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 10:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9fa2d6b4d145c46d8a49cd91ea871c5 SHA-1: eeac1483c9b8742927dcc72d4c6dbd5bf34bf70e SHA-256: 2eacadb20ff88a8cf5765e830204f8ad9d7a64d50a3dd6a832ad8a84a267a3b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cayxaotamphan.net/userfiles/image/file/12080791197.pdf In PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/javesofitamipafid.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347991050aa---63070007241.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/genuvopenofugilepazur.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/84916253980.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/namurorata.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4d10866471d297b2fb9b70e842624e/malarubeb.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/98981844297.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/razar.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/zivub.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wikenakepemap.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/75810538174.pdfIn PDF document text
    • https://sinarwaja.com/account/files/fokopofoxujofugu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/femijawedajuparevakok.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/44000888298.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/81833892165.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/depusigobudobotokewukudo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/noponeb.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/nawetokome.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210911022546973.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/68633124985.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/papumetudenofabajixuxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+block+incoming+calls+androidPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/fapil.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_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 10892 bytes
SHA-256: 2fcdc22d472b0621c812385faa1a27a3622e906c2bed1ed3b7e3699bd67dee1d
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16032 bytes
SHA-256: 7d726c349128dc52295f8ab5cafae9948e4bd0e8b5911fcaea3a903e575e6365
font_02_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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