Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbf751abfd388dd…

MALICIOUS

PDF

96.7 KB Created: 2021-09-17 09:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff326e3e42afe4147a46c912a236face SHA-1: aa7a217a8ac3e742c0d0cf49e1ab06650de8d241 SHA-256: 8fbf751abfd388dd3a4e074d05a9deb42c2b1eddbfe8f7ae7d6b0345637dbcdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to disposable domains and are structured as a link farm. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=star+trek+phone+game PDF link annotation
    • http://faithleader.org/js/ckfinder/userfiles/files/72426214426.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/63785027944.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/68833059145.pdfIn PDF document text
    • https://viettrungson.com/media/Files/27614323776.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/31531301986.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/giwovegikuzu.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/5818482634.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/71017748179.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210917142156.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/fatunej.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mavaxosotu.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zalivovaris.pdfIn PDF document text
    • http://vhz.cz/user-files/marewes.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fumat.pdfIn PDF document text
    • http://kustari.net/userfiles/file/piwarawulin.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xesilinu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/sagidegibaratiz.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/23749310205.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161361ed218ef0---pimikiruzi.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/sofajifas.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/kudasewinetevabuk.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/73650520648.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/zezuxaburuxam.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_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 10560 bytes
SHA-256: d52f6196719eba3861b02bbdc5ec1a807c3be141c3c87c8d227cfc333cdb6918
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E8 18944 bytes
SHA-256: f576de4120ea1097f6dfe40882724e2731038c4c8ef2c4fb8a365d927d037e5b

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