Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb2ca798ebd5357…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 23:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90d3361d254875618426ccaba96acc2e SHA-1: 7ca60abbae1932fd0063aa7bb7bf85719a96d621 SHA-256: ecb2ca798ebd535702f1ed6cfa760137a11a0e71307fadff1486236749a8a669
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or unwanted software. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://muachungbaohiem.com/uploads/userfiles/file/ripesegasedagusidaseru.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/90717246433.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/38589880996.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/39555944644.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/66252071611.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/56422183380.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/zirajisukaxosorusonusu.pdfIn PDF document text
    • http://linza-market.ru/upload/files/64403115660.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/46996718901.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/33554343425.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/67980566492.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6b60f0f4---nomijowigonemuwonutugibe.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/wivumevorikebufojonijugas.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/sifiwel.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vasewarakeduxek.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/xadevokubusire.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/kiledaveniwewipifop.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fijudakagow.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5k1btjgok5hvpulgjgj3l48ds3/ninede.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fozobepukofesa.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/2363808113.pdfIn PDF document text
    • http://christopherdallo.com/file/33637147360.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/26156081633.pdfIn PDF document text
    • http://greenld.com/userfiles/1492251171.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/23541910847.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/natututafomidavedumunig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=geometry+dash+apk+all+unlockedPDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16944 bytes
SHA-256: 81bea4c2924a1b8323de53b5e4c7378ee66491a05dea8982429039f453218262
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 11032 bytes
SHA-256: 2f0c58810e5efacad61f234b8e0705012a1f8815f13a7c8d6397fc0e70e33086
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1