Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05afad0e5a3298a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 16:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a4152e4e3b2da726f1ff4138afe8691 SHA-1: 7ed2737fd3c2d714fe0b8ac51400249a519b9531 SHA-256: f05afad0e5a3298a161d3bad4deffb458c715808aaf41e445f8cc4d014861c5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to 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 0.9981

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://maviet.vn/upload/files/vudowagenesixodevex.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/66379368744.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/47090931612.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gezokuzexaluvuletijid.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vanule.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78a79addf---pafusokuz.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/67632058497.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/10013427306.pdfIn PDF document text
    • http://schokofontaenen.de/idata/13064430986.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/taxenidiw.pdfIn PDF document text
    • https://designclarf.it/file/dinavodi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/8252811099.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210909191340.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/29844319526.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/tulegumujinev.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/gasezerezelej.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/33478112917.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161345b435e0b8---1652441528.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/4032965952.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/movep.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/junor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=polio+leg+weaknessPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17584 bytes
SHA-256: 7bde7f325d34673755dbe08f94137c7b2650f1f96dd75c3d41edf43e2973e8b6
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 10264 bytes
SHA-256: ac3e20047e71ba6101e0ac568854c409e191bf09bb0e83b875424fd64b2c7e7e
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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