Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc620130c8d68ea2…

MALICIOUS

PDF

95.5 KB Created: 2021-09-22 12:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d27f8bdd5b25ebde2d1ac9dbfa2d9c0 SHA-1: 8d4636460724b52036a4f737aa5daab643881f8e SHA-256: bc620130c8d68ea2c113ec6f47b4960756db3c27c8d5291002ea1ae00c5fd35f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cainghienbinhduong.com/uploads/userfiles/file/rojogemoxubusazilub.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/56869820703.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u35tdqhthv3606mbh15p1okh6b/69161531766.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/37598747855.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050850456194.pdfIn PDF document text
    • http://espokebar.com/uploads/files/lomalu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/sodozomi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/pubebetifunifisebo.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/58909496489.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/fumusanewi.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/10663900040.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109100159237849.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/kawoniwebivivo.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/xutuki.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/11247705427.pdfIn PDF document text
    • http://kelsenator.com/userimages/25581790280.pdfIn PDF document text
    • http://slsnn.ru/content/files/28862441897.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/vuloxuxojidov.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f62f4a659---36421549243.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tubovakunizesape.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/15310130877.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/kezikula.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/nilewawuvutomer.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/15059054871.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/35035769454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+piece+volume+1+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_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 21740 bytes
SHA-256: 6b4a5638d83a7aa5b50af04eade906239bb1517c7aa2ac19ea50874d37968142
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 10636 bytes
SHA-256: 31cc0eed5f1d69a8032d25785aeda9d7cab6b2f0271e440a3aa59dbe540d2e69
font_02_sfnt_off00015713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1