Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb63cc817223c28f…

MALICIOUS

PDF

75.6 KB Created: 2021-10-25 16:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aef2832407fe637052e3c5b5bc65cd58 SHA-1: 2fd811c846e7d31044c5b802f2e1e52f7fb20905 SHA-256: eb63cc817223c28fc91d0ba286224bf9c72adc1024e9910c635b815485c3354d
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=oxford+english+for+careers+technology+2+teacher%27s+book+pdf PDF link annotation
    • https://soudurelausiere.com/upload/editor/file/50439772584.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sotesutaja.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/lekaw.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021100322532365.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45314617931.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/76703669622.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/56540920770.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/roxidun.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/12400946824.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/22291985874.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/67398345995.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc1e6b80a---nuwidulojisav.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lutisigiwanulekuzexik.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rusedu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/82448654471.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/xegenotogike.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/60836259460.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/winebi.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20211005_1C892BA870DD7079.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/75037850192.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/dubojajivevajiv.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/76926120325.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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 11528 bytes
SHA-256: 05bbfeef4aa289927ba7033cae985193be40f5961a4d439b14c245c306c2ca9b
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 18760 bytes
SHA-256: 894f794117bf0a7546fbc85551a8c227001513cefd4bdcdedd4b1fbd6b43f111

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