Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65ecc0a70dbc704…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 05:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a1738c9cfef09bea217ab921afadea2f SHA-1: 322888fd670edee50b283a118ac636cc4d9783b9 SHA-256: f65ecc0a70dbc704c219ee12f112e47602ad7301df4224a35ebc9847b0d6e286
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=after+defrosting+chicken+how+long+can+it+stay+in+the+fridge PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b854daed3f0c6a95c8521c0a5123cc80/futekiwojodotakusu.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/26779405886.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/10214165439.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/56911762002.pdfIn PDF document text
    • http://qwerty.pl/_data/file/fidajureduzi.pdfIn PDF document text
    • https://asi-filter.pl/files/file/92369595328.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/juvubiravagoxamuju.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/9970238167.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/72730507969.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78595705556.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lonekakobukel.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c815935e57---20316386653.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/xumemi.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/47898976342.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/nemibunikipunubarupabagip.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210925215523_599963422.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161513f499732e---91020179224.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37387632989.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/vujaxewi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/15773476590.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/89331353072.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/guvowinatidajizidexu.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/tamavopowuw.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/76627906901.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pekiteti.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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 15604 bytes
SHA-256: 19f44ee9b6ed2a2193822ca951f9c77315ae846fc7361e604e2716e5755ae4b4
font_01_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 11028 bytes
SHA-256: ae757de198d97dbaa5e410e3d7fe7d6794eafc6033d59552c59128fd0c84c486
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1