Malicious PDF — malware analysis report

Static analysis result for SHA-256 3815943656d35d6c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 13:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26b1420db4ae732436bef2f298d7a78a SHA-1: 793869ce6e3ae52d6acd560924c74946a306207d SHA-256: 3815943656d35d6c28e75e908012de5c5894d0c29e7b69b44cafa2b9b2d66419
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded JavaScript points to an attempt to execute malicious code within the PDF viewer.

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 http://alianzablue.com/aym_image/files/waxomixeji.pdf In PDF document text
    • http://kolbiko.com/images/uploads/file/madiwobakuvifibisuj.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/dewokojutikumelapowek.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/pewunajamikibexifojizal.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/122235273527.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/ranotebuniz.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/lenoreduw.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gopurobopeligajesufelevu.pdfIn PDF document text
    • http://rsst77.ru/upload/files/sodagekika.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/10258491733.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tokeletojilakon.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/26419897666.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/49247515950.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/40948196982.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/tunukajovuwepopefemabiwow.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/51974403388.pdfIn PDF document text
    • http://hidropro.hu/upload/60061021497.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/82259656687.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/51644161375.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34d8a62af84ec2979145d4dc309ef8d/2559676573.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/lizev.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/172e80c2808122a8e04b83d5d0ce5c44/dokomap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+volume+control+with+seekbarPDF 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_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 17972 bytes
SHA-256: c275e3d99ee9909a9d503495f75a537bfc1ed4ec4b2c606f1f09dc123fd8c8c2
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 11100 bytes
SHA-256: e31ae476516c8703639cd51a4918bd2b853d7cecf56079fd65641708a9b8eaf6

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