Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c06c3b2d2ab21e4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4c98b2a993c27c40dc6508371553726 SHA-1: 18bffc8928188bfdc6a28ba3a38b49d97ac3ef82 SHA-256: 7c06c3b2d2ab21e4fafd850ab8457fe202c75c94468bea2f7f3f65600dc08aac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mbjarrahi.com/UploadedFiles/New/file/pisenufe.pdf In PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/borazuwafoxer.pdfIn PDF document text
    • https://plasy.com/uploads/file/fidolomegudovadepewera.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/liwiresuzovebawage.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/39019075066.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/towudajetu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ddd8a2cf---85213343103.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/55855592752.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210903_201657_8304.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/13924993636144416188ce7.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109031351147545.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/kejowiluwiwibijasugedaf.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/49012014919.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/75700191300.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/26907462469.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/46519460586.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/21658655072.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sedezidadiropegukare.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/nakofujeg.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tog3dks2tqdjv0ai9suq2t8rj4/damelorutajudos.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/selotawutemebuposeseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=carx+drift+hack+downloadPDF 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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 10584 bytes
SHA-256: 218a9467f57099cb12be9f96b00b1c0a8e83ea505e6244f31a9349d2dbfd270a
font_02_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16632 bytes
SHA-256: 80bb553e1dbdc475f94a5bb88be85437332e5c48af075036211484e571818094

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