Malicious PDF — malware analysis report

Static analysis result for SHA-256 023468b0a37a142a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 03:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59bc09b9b0dd919979d54e00f8b60277 SHA-1: da6cc3e244326c13183cb0ae41b62d08340d46c1 SHA-256: 023468b0a37a142a201c557610d5fdbd0ca7dc705581d9a6893a362cbce52999
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to compromised sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=envoyer+un+pdf+par+sms+android PDF link annotation
    • http://penzionriverside.cz/files/file/75130690318.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/kunonitijezojujizedodis.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/68009164463.pdfIn PDF document text
    • https://lasanisports.com/files/musesetagulenuk.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/fasalurafamedadudi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nagajefif.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/8476875857.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/xopalixutazukuwozu.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/fuxokow.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/98044772761.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/jexolon.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/20320634104.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/61490124077.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/73229793768.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109071238223063.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/76835536770.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/gabikadevupefewimuxabup.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/15019756864.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5359fd07---12107376277.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/36586693225.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/34133537507.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fapojixifetazapiwof.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/77386550036.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/27568215877.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/37837618093.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/60409771455.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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 18708 bytes
SHA-256: 6d793fc56aee0f09ec71e3d9d7fd9adf4de072ccbaba3a74bd848fade8b2e459
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10776 bytes
SHA-256: e901a93905bf8ee592d6818d48b9ca9009c6d3b97d99b22233a584682893b815
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1