Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c76e1168ec9975…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 11:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c4c34bf5139c5478a79473c01a6de76 SHA-1: d11f6bc3dcc7ca9763fc2e4e27fb3cbc7e9fb16f SHA-256: f3c76e1168ec99753e10c8ebb4873ccf294700bf2c8eaf9f49a068889d550f25
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external links, many of which are algorithmically generated and hosted on disposable domains. ClamAV and ML classifiers flagged this as malicious, indicating a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=material+design+new PDF link annotation
    • http://skyrybupaslaugos.lt/uploads/files/benofujit.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/49447167589.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34178206832.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35211654175.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/57924065559.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/buponune.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/43347105763.pdfIn PDF document text
    • https://grnca.org/img/files/files/tarovukugejasa.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/ripagevotep.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/43242393628.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210911_045629.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/9718490183.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/94558668598.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/60075233239.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/wisoxobufurifadir.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8092095379.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/1576656337.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/68571462885.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/molasixoroxedojesagir.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109112159361439.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/69245711990.pdfIn PDF document text
    • https://krusomying.com/data/file/sowabonozuzupixunod.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/jomeminavurasolipo.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/sakamipodedurupavi.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/98805399436.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d93b4b50282974c98c4e4012f2208f2e/51099480842.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/dutetuwadiwenukegime.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/75957193057.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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 17440 bytes
SHA-256: 20822e5288cf5fecd26dbb54f57d695e2a4f620664d34ca0b769e150eb8a4918
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 10384 bytes
SHA-256: 896bdb4a09586f4392b2b200d82486e4210d9f8104c39f39dbeebfc4aaaa77fb